if the price of an article went up by 25 % , then by what percent should it be brought down to bring it back to its original price ?
let the price of the article be rs . 100 . 25 % of 100 = 25 . new price = 100 + 25 = rs . 125 required percentage = ( 125 - 100 ) / 125 * 100 = 25 / 125 * 100 = 20 % . answer : a
multiply(divide(25, add(const_100, 25)), const_100)