if the radius of a circle is increased by 20 % then the area is increased by :
"initially a = pi * r 2 now r 2 = 120 / 100 r then area = pi * ( 120 r / 100 ) 2 area = 144 r / 100 that is area increases from 100 to 144 = increase in area = 44 % answer : a"
multiply(subtract(divide(const_100, const_100), power(subtract(divide(const_100, const_100), divide(20, const_100)), const_2)), const_100)