1.
A sum of money place at compound interest doubles itself in 4 years. In how many years will it amount to eight times itself?

2.
The sum of money at compound interest amounts to thrice itself in 3 years. In how many years will it be 9 times itself?

3.
The C.I. on a certain sum for 2 years Rs.41 and the simple interest is Rs.40. What is the rate percent?

4.
Simple interest on a sum at 4% per annum for 2 years is Rs.80. The C.I. on the same sum for the same period is_______?

5.
Find the C.I. on a sum of Rs.1600 for 9 months at 20% per annum, interest being compounded quarterly?

6.
At the end of three years what will be the compound interest at the rate of 10% p.a. on an amount of Rs.20000?

7.
Rs.8000 become Rs.9261 in a certain interval of time at the rate of 5% per annum of C.I. Find the time?

8.
Find out the C.I on Rs.5000 at 4% p.a. compound half-yearly for 1 1/2 years.

9.
If Rs.7500 are borrowed at C.I at the rate of 4% per annum, then after 2 years the amount to be paid is_______?

10.
Find the compound interest and the amount on Rs.8000 at 5% per annum for 3 years when C.I is reckoned yearly?

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