the area of a circle is increased by 1500 % . by what percent has the diameter of the circle increased ?
"the area of the circle is increased by 1500 % , thus the area is increased 16 times . the area of a circle it proportional to the square of the diameter ( area = π d ^ 2 / 4 ) , therefore the diameter must increase 4 times ( diameter increase 4 times = area increase 16 times ) , which is increase by 500 % . answer : b ."
multiply(const_100, divide(const_2, const_2))