if the price of an article went up by 30 % , 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 . 30 % of 100 = 30 . new price = 100 + 30 = rs . 130 required percentage = ( 130 - 100 ) / 130 * 100 = 30 / 130 * 100 = 23 1 / 13 % answer : b"
multiply(divide(30, add(const_100, 30)), const_100)