the length of a rectangle is reduced by 10 % . by what % would the width have to be increased to maintain the original area ?
"sol . required change = ( 10 * 100 ) / ( 100 - 10 ) = 11.1 % b"
multiply(divide(subtract(const_1, divide(subtract(const_100, 10), const_100)), divide(subtract(const_100, 10), const_100)), const_100)