**Compound Interest Class 8 Worksheets**.

**Compound
Interest Class 8 Worksheet 1 with Answers**

**1. **In how many years, ₹ 120 will produce the
same simple interest as ₹ 640 produce in 3 years at same rate of interest 3^{1}/_{2}
% p.a.?

**2.
**Match the following:

a.
Principal = ₹ 1200, rate = 6%, time = 4 years, then SI = i. ₹ 24

b.
Principal = ₹ 40000, rate = 7% p.a., time = 2 years, then CI = ii. ₹ 5796

c.
Principal = ₹ 160, rate = 3% p.a., time = 5 years, then SI = iii. ₹ 702

d.
Principal = ₹ 5400, rate = 3^{1}/_{4} %, time = 4 years, then SI = iv. ₹ 68

e.
Principal = ₹ 3400, rate = 2%, time = 1 year, then CI = v. ₹ 288

**3. **A sum was lent at simple interest at a certain rate for 5 years.
Had it been 1% higher rate, it would have fetched ₹ 50 more. What is the sum?

**4.
**A sum of money doubles in 6 years. In how many
years, it will treble at SI?

**5.
**State true or false.

a.
Simple interest allows you to earn interest on interests.

b.
In simple interest, the principal remains constant for the entire loan period.

**6. **The difference between CI and SI on a certain sum of money for 2
years at 5% per annum is ₹ 1. What is the sum?

**7. **A man deposited ₹ 6000 in a bank at 8% p.a. simple interest for 4
years. For how many years must another man deposit an amount of ₹ 6400 at 6%
p.a. in another bank so that both of them get the same interest?

**8. **The simple interest on a certain sum of money
for 4 years at 8% per annum is half the simple interest on ₹ 4000 for 2 years
at 10% per annum. Find the sum.

**9.
**A sum of money lent at compound interest
annually amounts to ₹ 250 and ₹ 300 in the first and the second year. Find
the rate of interest.

**10. **Minakshi borrowed two loans at simple interest
i.e., one for ₹ 10,000 at 4% per annum and the other for ₹ 15000 at 6% p.a.
for the same period. If she paid ₹ 6500 as total interest, find the period for
which the loans were taken.

**11. **Calculate the amount due and the compound
interest on ₹ 15000 in 2 years when the rate of interest on successive years
is 7% and 9% respectively.

**Compound
Interest Class 8 Worksheet 2**

**1. **At what rate of compound interest will ₹ 20000
becomes ₹ 24200 after 2 years?

**2. **Find the simple interest on ₹ 9520 at 8.4%
per annum for 4 years 8 months.

**3. **Choose the correct option.

a. The compound
interest and simple interest for the 2nd year on a sum are

i. same

ii. different

iii. depends on sum

iv. depends on rate of interest

b. Principal +
Interest = ________

i. Time

ii. Compound Interest

iii. Amount

iv. Rate of interest

c. What will be
the interest when ₹ 100 is invested for 3 months at the rate of 2.5% per
quarter?

i. ₹ 2.5

ii. ₹ 25

iii. ₹ 10

iv. ₹ 30

d. In the case of
compound interest, the principal ________ every year.

i. constant

ii. depends on rate

iii. depends on sum

iv. changes

**4. **Find the difference between the compound
interest and the simple interest on ₹ 6000 for 3 years at 10% per annum.

**5. **Find the simple interest on ₹ 13870 at 7^{1}/_{2}
% p.a. from 15th August 2011 to 20 January 2012. Also, find the amount.

**6. **The difference between CI and SI for 2 years
at 10% per annum is ₹ 50. Find the sum.

**7. **Simple interest on a certain sum of money for
2 years at 6^{1}/_{2} % per annum is ₹ 5200. What will be the
compound interest on the sum at the same rate and for the same period?

**8. **Reena borrowed some money from a money lender
at 20% p.a. compound interest. After 3 years, she paid ₹ 582.40 as CI to the
money lender. What amount did she borrow?

**9. **Find the compound interest at 5% p.a. for 3
years on the same principal which gives simple interest of ₹ 2400 at the same
rate and for the same time.

**10. **At what time will ₹ 5400 yield ₹ 1373.76 as
compound interest at 12% p.a.?

**11. **Priti deposited ₹ 2,40,000 with a private
company for a period of 9 months. The company credits the interest in her
account at 3% quarterly. What interest did she get?

**12. **Hemant borrowed ₹ 2000 at 20% p.a. simple interest.
Find the amount of money he needs to pay after 1^{1}/_{2}
years.

**13. **Meera invests ₹ 93750 at 9.6% per annum for 3
years and the interest is compounded annually, calculate:

a. the amount
outstanding to him at the end of second year.

b. the interest
for third year.

**14. **If the interest charged for 9 months be 0.18
times the money borrowed. Find the rate of SI per annum.

**15. **A sum of money lent at compound interest
yields ₹ 100 at the end of 1st year and ₹ 105 at the end of 2nd year. Find the
rate % per annum.

**ANSWERS**

**Worksheet
1**

1. 16
years

2. a.
v b. ii

c. i d. iii

e. iv

3. ₹ 1000 4. 12 years

5. a.
False b. True

6. ₹ 400 7. 5 years

8. ₹
1250 9. 20%

10. 5
years

11. ₹
17,494.50; ₹ 2494.50

**Worksheet
2**

1. 10% 2. ₹ 3731.84

3. a.
ii b. iii

c. i d. iv

4. ₹
186 5. ₹ 404.70

6. ₹
5000 7. ₹ 5369

8. ₹
800 9. ₹ 2522

10. 2 years

11. ₹ 22,254.48

12. ₹ 2600

13. a. ₹ 1,12,614

b. ₹ 10,810.94

14. 24%
15. 5%

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