a merchant marks his goods up by 40 % and then offers a discount of 20 % on the marked price . what % profit does the merchant make after the discount ?
"let the price be 100 . the price becomes 140 after a 40 % markup . now a discount of 20 % on 140 . profit = 112 - 100 12 % answer e"
subtract(subtract(add(40, const_100), divide(multiply(add(40, const_100), 20), const_100)), const_100)