Find the sum on which the difference between the simple interest and the compound interest at the rate of 8% per annum compounded annually be ₹ 64 in 2 years.

A sum of ₹ 13500 is invested at 16% per annum compound interest for 5 years. Calculate :

(i) the interest for the first year.

(ii) the amount at the end of the first year.

(iii) the interest for the second year, correct to the nearest rupee.

Ashok borrowed ₹ 12000 at some rate per cent compound interest. After a year, he paid back ₹ 4000. If compound interest for the second year be ₹ 920, find :

(i) the rate of interest charged

(ii) the amount of debt at the end of the second year.

On a certain sum of money, let out at C.I., interests for first, second and third years are ₹ 1500; ₹ 1725 and ₹ 2070 respectively. Find the rate of interest for the (i) second year (ii) third year.