a pair of articles was bought for $ 50 at a discount of 30 % . what must be the marked price of each of the article ?
"s . p . of each of the article = 50 / 2 = $ 25 let m . p = $ x 70 % of x = 25 x = 25 * . 7 = $ 17.50 answer is b"
divide(multiply(subtract(const_100, 30), divide(50, const_2)), const_100)