a bookseller sells his books at a 15 % markup in price . if he sells a book for $ 23.00 , how much did he pay for it ?
"let the cost price of book = x selling price of book = 23 $ markup % = 15 ( 115 / 100 ) x = 23 = > x = 20 answer e"
subtract(23.00, multiply(divide(15, const_100), 23.00))