In how many years will Rs 2000 become Rs 2420 at 10 percent compound annual interest?

If the difference between the compound interest and simple interest on a certain sum at 5% per annum for 3 years is Rs.11.40, what is the approximate sum? 

Anu invested Rs. 15000 at the rate of interest 10% p.a. for one year. If the compound interest is compounded at every six months, what amount will Anu get at the end of the year?

Mr. Mike borrowed Rs. 8500 at 4 % per annum compound interest. The compound interest compounded annually for 2 yeas is:

1261 in 3 years at the rate of 5 percent annual interest on a sum of money. Interest is received by compound . money will be

What is the compound interest on Rs. 48,000 for 2 years at 20% p.a., if interest is compounded annually?

A sum of money doubles itself at compound interest in 15 years. In how many years it  will become eight times?

If the difference between 2 years compound interest and simple interest at the rate of 5 percent of an amount is Rs. 25, then that amount will be?