the length of a rectangle is reduced by 20 % . by what % would the width have to be increased to maintainthe original area ?
"sol . required change = ( 20 * 100 ) / ( 100 - 20 ) = 25 % c"
multiply(divide(subtract(const_1, divide(subtract(const_100, 20), const_100)), divide(subtract(const_100, 20), const_100)), const_100)