a trader bought a car at 15 % discount on its original price . he sold it at a 40 % increase on the price he bought it . what percent of profit did he make on the original price ?
"original price = 100 cp = 85 s = 85 * ( 140 / 100 ) = 119 100 - 119 = 19 % answer : a"
multiply(subtract(divide(divide(multiply(subtract(const_100, 15), add(const_100, 40)), const_100), const_100), const_1), const_100)