the length of a rectangle is reduced by 30 % . by what % would the width have to be increased to maintain the original area ?
"sol . required change = ( 30 * 100 ) / ( 100 - 30 ) = 42.8 % a"
multiply(divide(subtract(const_1, divide(subtract(const_100, 30), const_100)), divide(subtract(const_100, 30), const_100)), const_100)