a man bought 40 shares of rs . 80 at 5 discount , the rate of dividend being 12 1 / 2 % the rate of interest obtained is
"explanation : face value of a share = rs . 80 he bought each share at rs . 80 - rs . 5 = rs . 75 number of shares = 40 dividend = 12 1 / 2 % = 25 / 2 % dividend per share = 80 × 25 / 2 / 100 = rs . 10 total dividend = ( 40 × 10 ) ie , he got a dividend of ( 40 × 10 ) for an investment of rs . ( 40 × 75 ) interest obtained = 40 × 10 × 100 / 40 × 75 = 13.33 % answer : option a"
divide(multiply(multiply(40, 80), divide(12, const_100)), multiply(40, subtract(80, 5)))