Sheela has a recurring deposit account in a bank of ₹ 2000 per month at the rate of 10% per annum. If she gets ₹ 83100 at the time of maturity, find the total time (in years) for which the account was held.

A man deposits ₹ 900 per month in a recurring account for 2 years. If he gets ₹ 1800 as interest at the time of maturity, find the rate of interest.

By investing ₹ 10,000 in the shares of a company, a man gets an income of ₹ 800; the dividend being 10%. If the face-value of each share is ₹ 100, find :

(i) the market value of each share.

(ii) the rate percent which the person earns on his investment.

A man holds 800 shares of ₹ 100 each of a company paying 7.5% dividend semi-annually.

(i) Calculate his annual dividend.

(ii) If he had bought these shares at 40% premium, what percentage return does he get on his investment ?