to produce an annual income of rs . 800 from a 8 % stock at 90 , what is the amount of stock needed ?
"since face value is not given , take it as rs . 100 . as it is an 8 % stock , income ( dividend ) per stock = rs . 8 ie , for an income of rs . 8 , amount of stock needed = rs . 100 for an income of rs . 800 , amount of stock needed = 100 × 800 / 8 = 10000 answer is a ."
subtract(const_100, 90)