Calculate the compound interest for the second year on ₹ 12,000 invested for 3 years at 10% per year. Also, find the sum due at the end of the third year.

A certain sum, at compound interest, becomes ₹ 7,396 in 2 years and ₹ 7,950.70 in 3 years. Find the rate of interest.

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.