a pair of articles was bought for $ 810 at a discount of 10 % . what must be the marked price of each of the article ?
"s . p . of each of the article = 810 / 2 = $ 405 let m . p = $ x 90 % of x = 405 x = 405 * 100 / 90 = $ 450 answer is d"
divide(multiply(subtract(const_100, 10), divide(810, const_2)), const_100)