The compound interest on 12000 for 9 months at 20 % per annum , interest being compounded quarterly is 

A certain sum of money at a certain rate doubles itself in 9 years, then in how many years it will become the same sum will be 5 times of itself?

The simple and compound interest that can be earned in two years at the same rate is Rs 1500 and Rs 1575 respectively. What is the rate (% per annum) of interest?

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 man borrows some money at 3% simple interest per annum and lends it to somebody at 5% interest to be compounded annually. By this he makes a profit of Rs.541 at the end of 3 years. The money he borrowed was-

The compound interest on Rs. 6250 at 12% per annum for 1 year, compounded half-yearly is

The compound interest earned in two years at 8 % per annum is 3993.6 . What is the sum invested? 

A sum of Rs 5,000 amounts to Rs 7,200 in 8 years at a certain rate percent p.a, interest compounded yearly. What will be the compound interest on a sum of Rs.6,550 in 4 years at the same rate of interest?