the cost price of an article is 64 % of the marked price . calculate the gain percent after allowing a discount of 25 % ?
"let marked price = rs . 100 . then , c . p . = rs . 64 , s . p . = rs . 75 gain % = 11 / 64 * 100 = 17.1 % . answer : d"
multiply(subtract(divide(subtract(const_100, 25), 64), const_1), const_100)