A sum of money is lent at 8% per annum compound interest. If the interest for the second year exceeds that for the first year by ₹ 32, find the sum of money.

A man invests ₹ 7,000 for three years, at a certain rate of interest, compounded annually. At the end of one year it amounts to ₹ 7,980.

Calculate :

(i) the rate of interest per annum.

(ii) the interest accrued in the second year.

(iii) the amount at the end of the third year.

Simple interest on a certain sum of money at 9% is ₹ 450 in 2 years. Find the compound interest, on the same sum, at the same rate for 1 year, if the interest is reckoned half yearly.

Find the difference between simple interest and compound interest on ₹ 4,000 for two years at 10% per annum.