a merchant marks his goods up by 50 % and then offers a discount of 10 % on the marked price . what % profit does the merchant make after the discount ?
"let the price be 100 . the price becomes 150 after a 50 % markup . now a discount of 10 % on 150 . profit = 135 - 100 35 % answer d"
subtract(subtract(add(50, const_100), divide(multiply(add(50, const_100), 10), const_100)), const_100)