a pair of articles was bought for $ 900 at a discount of 10 % . what must be the marked price of each of the article ?
"s . p . of each of the article = 900 / 2 = $ 450 let m . p = $ x 90 % of x = 450 x = 450 * 100 / 90 = $ 500 answer is b"
divide(multiply(subtract(const_100, 10), divide(900, const_2)), const_100)