a merchant marks his goods up by 20 % and then offers a discount of 5 % on the marked price . what % profit does the merchant make after the discount ?
"let the price be 100 . the price becomes 120 after a 20 % markup . now a discount of 5 % on 120 . profit = 114 - 100 14 % answer d"
subtract(subtract(add(20, const_100), divide(multiply(add(20, const_100), 5), const_100)), const_100)