If the present worth of a certain sum due 2 years hence at 10% per annum at a compound interest principal is Rs. 2500, find the amount.

Compute the compound interest on ₹ 8,400 for one and half years at 12% rate of interest per annum, compounded half yearly.

A sum invested at compound inrerest amounts to ₹7,800 in 3 years and ₹11,232 in 5 years. What is the rate per cent? 

If interest be compounded half-yearly, then find the compound interest on ₹8,000 at the rate of 20% per annum for 1 year. 

The compound interest on a sum of ₹5,500 at 15% p.a. for 2 years, when the interest is  compounded 8 monthly, is:

What is the difference (in ₹) between the simple interest and the compound interest on a sum of ₹8000 for years at the rate of 10% p.a., when the interest is compounded yearly?

A certain sum, invested at 4% per annum compound interest, compounded half yearly, amounts to Rs. 7,803 at the end of one year. The sum is: