In what time will ₹1500 yield ₹496.50 as compound interest at 10% per annum compounded annually?

Find the time (in years) in which ₹12500 will produce ₹3246.40 as compound interest at 8% per annum, interest compounded annually.

What sum will amount to ₹2782.50 in 2 years at compound interest, if the rates are 5% and 6% for the successive years?

A sum of money is invested at compound interest payable annually. The interest in two successive years is ₹225 and ₹240. Find :

(i) the rate of interest.

(ii) the original sum.

(iii) the interest earned in the third year.