a pair of articles was bought for $ 360 at a discount of 10 % . what must be the marked price of each of the article ?
"s . p . of each of the article = 360 / 2 = $ 180 let m . p = $ x 90 % of x = 360 x = 180 * 100 / 90 = $ 200 answer is a"
divide(multiply(subtract(const_100, 10), divide(360, const_2)), const_100)