a trader bought a car at 50 % discount on its original price . he sold it at a 80 % increase on the price he bought it . what percent of profit did he make on the original price ?
"original price = 100 cp = 95 s = 95 * ( 180 / 100 ) = 112 100 - 171 = 71 % answer : e"
multiply(subtract(divide(divide(multiply(subtract(const_100, 50), add(const_100, 80)), const_100), const_100), const_1), const_100)