the cost price of an article is 64 % of the marked price . calculate the gain percent after allowing a discount of 12 % ?
"let marked price = rs . 100 . then , c . p . = rs . 64 , s . p . = rs . 88 gain % = 24 / 64 * 100 = 37.5 % . answer : a"
multiply(subtract(divide(subtract(const_100, 12), 64), const_1), const_100)