Compound Interest

1.		The Simple interest on a certain sum for 2 years at 10% per annum is Rs. 90. The corresponding compound interest is:

Rs. 99

Rs. 94.50

Rs. 95.60

Rs. 108

2.		Amit borrowed a certain sum from Babu at a certain rate of simple interest for 2 years. He lent this sum to Charan at the same rate of interest compounded annually for the same period. At the end of two years, he received Rs. 2400 as compound interest but paid Rs. 2000 only as simple interest. Find the rate of interest.

40%

30%

20%

10%

3.		In what time will Rs. 1000 become Rs. 1331 at 10% per annum compounded annually?

1 year

4 years

3 years

6 years

4.		If a sum on compound interest becomes three times in 4 years, then with the same interest rate, the sum will become 81 times in:

18 years

12 years

16 years

14 years

5.		Certain sum becomes 3 times it self at compound interest in 10 years. In how many years it becomes 9 times?

25 years

27 years

30 years

20 years

6.		A sum of money placed at compound interest doubles itself in 4 years. In how many years will it amount to eight times itself?

16

8

12

20

7.		The difference between compound Interest and simple interest on an amount of Rs. 30,000 for 2 years is Rs. 192. What is the rate of interest per annum?

8%

11%

12%

12.5%

8.		The difference between simple and compound interest on a certain sum of money for 2 years at 4 per cent per annum is Re.1. The sum of money is:

Rs.600

Rs.625

Rs.650

Rs.500

9.		A money lender borrows money at 5% per annum and pays the interest at the end of the year. He lends it at 8% per annum compounded half yearly and receives the interest at the end of the year. In this way , he gains Rs 632 a year. The amount of money he borrows is:

20000

21000

22500

15000

10.		The least number of complete years in which a sum of money put at 20% compound interest will be more than doubled is:

3

2

5

4