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    NCERT Solutions Class 8 Math money math

NCERT Solutions for Class 8 Math Chapter 4 Money Math are provided here with simple step-by-step explanations. These solutions for Money Math are extremely popular among Class 8 students for Math Money Math Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the NCERT Book of Class 8 Math Chapter 4 are provided here for you for không lấy phí. You will also love the ad-không lấy phí experience on Meritnation’s NCERT Solutions. All NCERT Solutions for class Class 8 Math are prepared by experts and are 100% accurate.

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    What is the amount of a sum 32000 20% per annum for 9 months compounded quarterly?What will be the amount after 1 year on a sum of Rs 32000 20% per annum when the interest is compounded half yearly?What is the compound interest 10000 40 percent per annum for 9 months interest compounded quarterly?What will be the compound interest on a sum of 50000 12% pa for 6 months if the interest is payable quarterly?

Page No 65:

Question 1:

Mahadevan took out a loan of 5,000 rupees from a tank, which charges compound interest. The rate of interest was 10% for the first year, but it was increased to 12% during the second year. How much money should Mahadevan pay the end of two years to settle the debt?

Answer:

Principal, P = Rs.5000

Rate of interest for the first year, R1= 10% 

Rate of interest for the second year, R2= 12% 

Total amount including interest = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Total amount including interest for the first year 

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Now, principal for the second year = Rs.5500

Total amount including interest for the second year 

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Total amount to be paid by Mahadevan the end of two years to settle the debt = Rs.6160

Page No 65:

Question 2:

Compute the compound interest for 25,000 rupees 9% for 2 years.

Answer:

Principal, P = Rs.25000

Rate of interest, R = 9% 

Time, n = 2 years

Total amount including interest = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Total amount including interest 

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Compound interest = Amount − Principal 

= Rs.29702.50 − Rs.25000

= Rs.4702.5

Page No 65:

Question 3:

Verghese borrowed 16,000 rupees from a bank 8% compound interest. After 2 years, the interest rate was lowered to 6%. What is the total amount that Verghese has to repay the end of 3 years?

Answer:

Principal, P = Rs.16000

Rate of interest for the first two years, R1 = 8% 

Rate of interest for the third year, R2 = 6%

Total amount including interest = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Total amount including interest for the first two years

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Now, principal for the third year = Rs.18662.40

Total amount including interest 

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴Amount to be repaid by Verghese the end of 3 years = Rs.19782.14

Page No 67:

Question 1:

Rahim, Johny and Gopu deposited 10,000 rupees each, under different schemes, in a bank which gives 8% interest. Rahim gets simple interest, Johny gets interest compounded half-yearly and Gopu gets interest compounded quarterly. Compute the total amount each of them gets back after one year and compare these amounts.

Answer:

Amount deposited by Rahim, Johny and Gopu, P = Rs.10000

Rate of interest, R = 8%

Time, T = 1 year

For Rahim:

Simple interest = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Amount that Rahim gets = Principal + Simple interest 

= Rs.10000 + Rs.800

= Rs.10800

For Johny:

Interest for the first half-year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.400

Principal for the second half-year = Principal + Interest

= Rs.10000 + Rs.400

= Rs.10400 

Interest for the second half-year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.416

Amount Johny gets = Rs.10400 + Rs.416

= Rs.10816 

For Gopu:

Interest for the first quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.200

Principal for the second quarter = Principal + Interest

= Rs.10000 + Rs.200

= Rs.10200 

Interest for the second quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.204

Principal for the third quarter = Rs.10200 + Rs.204

= Rs.10404 

Interest for the third quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs 208.08

Principal for the fourth quarter = Rs.10404 + Rs.208.08

= Rs.10612.08

Interest for the fourth quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.212.24

Amount that Gopu gets = Rs.10612.08 + Rs.212.24

= Rs.10824.32

It can be observed that:

Amount received by Gopu > Amount received by Johny > Amount received by Rahim

Page No 67:

Question 2:

A person deposited 20,000 rupees in a bank which gives 6% interest compounded half-yearly. How much would he get back after 2 years?

Answer:

Amount deposited by the person, P = Rs.20000

Rate of interest, R = 6% compounded half-yearly 

Time, T = 2 years

Simple interest is given by the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Interest for the first half of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.600

Principal for the second half of the first year = Principal + Interest

= Rs.20000 + Rs.600

= Rs.20600 

Interest for the second half of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.618

Principal for the first half of the second year = Rs.20600 + Rs.618

= Rs.21218 

Interest for the first half of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.636.54

Principal for the second half of the second year = Rs.21218 + Rs.636.54

= Rs.21854.54

Interest for the second half of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.655.64

∴Amount received by the person after two years = Rs.21854.54 + Rs.655.64

= Rs.22510.18

Page No 67:

Question 3:

Ravi deposited 50,000 rupees in a bank, which gives 6% interest, compounded quarterly. How much would he get back after 9 months?

Answer:

Amount deposited by Ravi, P = Rs.50000

Rate of interest, R = 6% compounded quarterly

Time, T = 9 months = 3 quarters

Simple interest is given by the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Interest for the first quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.750

Principal for the second quarter = Rs.50000 + Rs.750 

= Rs.50750

Interest for the second quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.761.25

Principal for the third quarter = Rs.50750 + Rs.761.25 

= Rs.51511.25

Interest for the third quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.772.67

∴ Amount received by Ravi after nine months = Rs.51511.25 + Rs.772.67

= Rs.52283.92

Page No 67:

Question 4:

Lathika deposited 25,000 rupees in a bank which gives 8% interest compounded half-yearly. Najma deposited the same amount the same rate of interest, but compounded quarterly. What is the difference in the amounts they would get back after one year?

Answer:

Amount deposited, P = Rs.25000

Rate of interest = 8% compounded half-yearly

Time, T = 1 year

For Lathika:

Simple interest is given by the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Interest for the first half of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1000

Principal for the second half of the first year = Principal + Interest

= Rs.25000 + Rs.1000

= Rs.26000 

Interest for the second half of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1040

Amount received by Lathika after one year = Rs.26000 + Rs.1040

= Rs.27040

For Najma:

Interest for the first quarter = RsWhat is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.500

Principal for the second quarter = Principal + Interest

= Rs.25000 + Rs.500

= Rs.25500 

Interest for the second quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.510

Principal for the third quarter = Rs.25500 + Rs.510

= Rs.26010

Interest for the third quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.520.20

Principal for the fourth quarter = Rs.26010 + Rs.520.20

= Rs.26530.20

Interest for the fourth quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.530.60

Amount Lathika get back after one year = Rs.26530.20 + Rs.530.60

= Rs.27060.80

Difference between their amounts = Rs.27060.80 − Rs.27040

= Rs.20.80 

Page No 68:

Question 1:

A man deposits 50,000 rupees in a financial company, which gives 9% interest compounded every three months. How much would he get back after one year?

Answer:

Amount deposited by the man, P = Rs.50000

Rate of interest, R = 9%

Time, T = 1 year

Simple interest is given by the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

The interest is compounded quarterly 

∴ Interest for the first quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1125

Principal for the second quarter = Rs.50000 + Rs.1125 

= Rs.51125

Interest for the second quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1150.31 

Principal for the third quarter = Rs.51125 + Rs.1150.31

= Rs.52275.31

Interest for the third quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1176.19

Principal for the fourth quarter = Rs.52275.31 + Rs.1176.19

= Rs.53451.50

Interest for the fourth quarter = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1202.66

∴Amount received by the man after one year = Rs.53451.50 + Rs.1202.66

= Rs.54654.16

Page No 69:

Question 1:

The population of Kerala increases by 2% every year. The current population is 3 crores. What would be the population after 3 years?

Answer:

Current population of Kerala, P = 30000000

Rate of increase, r = 2% 

Time, n = 3 years

Population after n years can be calculated using the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Population after 3 years

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterlyPage No 69:

Question 2:

A TV manufacture reduces the price of a particular model by 5% every year. The current price of this model is 8000 rupees. What would be the price after 3 years?

Answer:

Current price of TV, P = Rs.8000

Rate of reduction, r = 5% 

Time, n = 3 years

Price of TV after n years can be calculated using the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Price of TV after 3 years

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterlyPage No 69:

Question 3:

Abu, Babu and Sabu deposited 10000 rupees each, under various schemes which give 10% interest. Abu gets interest compounded annually, Babu gets interest compounded every half-year and Sabu gets interest compound every quarter. Compute the total amount each would get after 2 years.

Answer:

Money deposited by Abu, Babu and Sabu, P = Rs.10000

Rate of interest, r = 10% 

Time, n = 2 years

For Abu:

We know that A =What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

∴ Amount received by Abu after 2 years

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

For Babu:

Simple interest is given by the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Interest for the first half of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.500

Principal for the second half of the first year = Principal + Interest

= Rs.10000 + Rs.500

= Rs.10500 

Interest for the second half of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.525

Principal for the first half of the second year = Rs.10500 + Rs.525

= Rs.11025

Interest for the first half of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.551.25

Principal for the second half of the second year = Rs.11025 + Rs.551.25

= Rs.11576.25

Interest for the second half of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.578.81

∴ Amount received by Babu after two years = Rs.11576.25 + Rs.578.81

= Rs.12155.06

For Sabu:

Interest for the first quarter of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.250

Principal for the second quarter of the first year = Principal + Interest 

= Rs.10000 + Rs.250

= Rs.10250

Interest for the second quarter of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.256.25

Principal for the third quarter of the first year = Rs.10250 + Rs.256.25

= Rs.10506.25

Interest for the third quarter of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.262.66

Principal for the fourth quarter of the first year = Rs.10506.25 + Rs.262.66

= Rs.10768.91

Interest for the fourth quarter of the first year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.269.22

Principal for the first quarter of the second year = Rs.10768.91 + Rs.269.22

= Rs.11038.13

Interest for the first quarter of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.275.95

Principal for the second quarter of the second year = Rs.11038.13 + Rs.275.95

= Rs.11314.08

Interest for the second quarter of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.282.85

Principal for the third quarter of the second year = Rs.11314.08 + Rs.282.85

= Rs.11596.93

Interest for the third quarter of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.289.92

Principal for the fourth quarter of the second year = Rs.11596.93 + Rs.289.92

= Rs.11886.85

Interest for the fourth quarter of the second year = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.297.17

Amount received by Sabu after two years = Rs.11886.85 + Rs.297.17

= Rs.12184.02

Page No 69:

Question 4:

A financial company claims that it charges only 20% interest on loans. But if a person takes out a loan of 100 rupees, he would get only 80 rupees, after subtracting the annual interest of 20 rupees the outset. And he has to pay back 100 rupees after one year. What is their actual rate of interest?

Answer:

If a person takes a loan of Rs.100, the financial company would give him Rs.80 after subtracting the interest of Rs.20. 

Principal, P = Rs.80

Let the actual rate of interest be r%. 

Amount after n years can be calculated using the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Amount after an year = Rs.100

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Thus, the actual rate of interest is 25%.

Page No 69:

Question 5:

Dileep and Manoj deposited the same amount under different schemes giving 10% interest. Dileep gets only simple interest, while Manoj gets interest compounded annually. After 2 years, Manoj had 50 rupees more than Dileep. How much money did each deposit?

Answer:

Rate of interest for Dileep and Manoj, R = 10%

Time, T = 2 years

Let the money each deposited be P.

For Dileep:

Simple interest = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Amount received by Dileep = Principal + Simple interest

= P +

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

For Manoj:

Amount = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Amount received by Manoj = Rs.50 + Amount received by Dileep

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Thus, Dileep and Manoj deposited Rs.5000. 

Page No 70:

Question 1:

A person deposits 6400 rupees in a bank, which gives 12% interest. How much interest would he get after one month? What would be the interest for one month 6%? What if it is 3%?

Answer:

Principal, P = Rs.6400

Rate of interest, R1 = 12%

Time, T = 1 month

Simple interest is given by the formula What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Interest for the first month = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.64

Rate of interest, R2 = 6%

Interest for the first month = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.32

Rate of interest, R3 = 3%

Interest for the first month = Rs What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.16

∴ Interest for one month 12% = Rs.64

Interest for one month 6% = Rs.32

Interest for one month 3% = Rs.16

Page No 70:

Question 2:

What is the interest for 16,000 rupees What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterlyfor one year? What would be the interest if the rate of interest is onlyWhat is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly.

Answer:

Principal, P = Rs.16000

Rate of interest, R1 = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Time, T = 1 year

Simple interest = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

Rate of interest, R2 = What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly%

Simple interestWhat is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly

= Rs.1000

∴ Interest for one year What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly% = Rs.2000

Interest for one month What is the amount in Rs of a sum of rs32 000 at 20% per annum for 9 months compounded quarterly% = Rs.1000

View NCERT Solutions for all chapters of Class 8

What is the amount of a sum 32000 20% per annum for 9 months compounded quarterly?

37044. Amount = 32000 + 5044 = 37044.

What will be the amount after 1 year on a sum of Rs 32000 20% per annum when the interest is compounded half yearly?

Hence, the compound interest on Rs. 32000 20% per annum for 1 year, compounded half yearly, is Rs. 6720.

What is the compound interest 10000 40 percent per annum for 9 months interest compounded quarterly?

=1576.25. Q.. Find the compound interest on Rs.

What will be the compound interest on a sum of 50000 12% pa for 6 months if the interest is payable quarterly?

The compound interest on rs 50000 for 6 months 12% per annum when the interest is compounded quarterly is Rs. 3045. #Learn more: Find the compound interest on Rs. Tải thêm tài liệu liên quan đến nội dung bài viết What is the amount in Rs of a sum of rs32 000 20% per annum for 9 months compounded quarterly

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