If the amount is $$3{3\over 8}$$ times the sum after 3 years at compound interest compounded annually, then the rate of interest per annum is 

A woman invests Rs. 2000 at the start of each year at 5% compound interest per annum. How much will her investment be at the end of the 2^nd year?

The compound interest on Rs.30,000 at 7% per annum is Rs. 4347. The period (in years) is:

In how many years will be Rs. 2,000 amounts to Rs.2,420 at 10% per annum compound interest ?

A sum of Rs. 12,000, deposited at compound interest becomes double after 5 years. How much will it be after 20 years? 

On a certain sum of money, the difference between the compound interest for a year, payable half yearly, and the simple interest for a year is Rs. 56.If the rate of interest in both the cases is 16 %, then the sum is 

In how much time compound money at compound interest of half yearly rate of Rs 800 will be Rs 926.10?

The sum for 2 years gives a compound interest of ₹ 3225 at 15 % rate. Then sum is