mahesh marks an article 15 % above the cost price of rs . 540 . what must be his discount percentage if he sells it at rs . 496.80 ?
"cp = rs . 540 , mp = 540 + 15 % of 540 = rs . 621 sp = rs . 496.80 , discount = 621 - 496.80 = 124.20 discount % = 124.2 / 621 * 100 = 20 % . answer : c"
divide(multiply(subtract(multiply(540, divide(add(const_100, 15), const_100)), 496.80), const_100), multiply(540, divide(add(const_100, 15), const_100)))