the cost price of an article is 64 % of the marked price . calculate the gain percent after allowing a discount of 12 % .
"sol . 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)