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

The difference between the compound interest and simple interest on a certain sum at the rate of 5% p.a in 3 years is Rs. 15.25. The sum is:

What will be the compound interest (compounded annually) of 3 years at the rate of 12.5 percent on an amount of Rs. 5120?

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?

The difference between compound interest and simple interest on a sum of money for 3 years at 8% per annum is Rs. 354.80. Find the sum.

A sum of money doubles itself in 4 years compound interest. It will amount to 8 times itself at the same rate of interest is -

The compound interest on Rs. 8,000 at 15% per annum for 2 years 4 months, compounded annually is:

The difference between the compound and the simple interest on a sum for 2 years at 10 % per annum , when the interest is compounded annually, is Rs.28. If the yearly interest were compounded half yearly, the difference in the two interests will be