each side of a rectangle is increased by 100 % . by what percentage does the area increase ?
original area = a * b where a and b are sides after increase in side increase in area will be = ( ( ( 2 a * 2 b ) - ( a * b ) ) * 100 ) / ( a * b ) = 300 % answer : a
multiply(subtract(multiply(const_2, const_2), const_1), 100)