a merchant marks goods up by 60 % and then offers a discount on the marked price . the profit that the merchant makes after offering the discount is 20 % . what % discount did the merchant offer ?
"let p be the original price of the goods and let x be the rate after the markup . ( 1.6 p ) * x = 1.2 p x = 1.2 / 1.6 = 0.75 which is a discount of 25 % . the answer is b ."
multiply(divide(subtract(subtract(add(const_1, divide(60, const_100)), const_1), divide(20, const_100)), add(const_1, divide(60, const_100))), const_100)