a pair of articles was bought for $ 720 at a discount of 10 % . what must be the marked price of each of the article ?
"s . p . of each of the article = 720 / 2 = $ 360 let m . p = $ x 90 % of x = 360 x = 360 * 100 / 90 = $ 400 answer is d"
divide(multiply(subtract(const_100, 10), divide(720, const_2)), const_100)