The radius of a sphere is increased by 50%. The increase in surface area of the sphere is : Choose the correct option:	A) 168	B) 125	C) 186	D) 197	E) 191
Explanation:   Take radius 100. Then surface area is 4 × ππ × 100 × 100.   After increase radius by 50% the radius becomes100 + 50% of 100 = 150   Then new surface area is 4 × ππ × 150 × 150   Then put the values into formula of percentage = 4π1502−4π10024π1002×1004π1502−4π10024π1002×100 = 125%   Answer: 125
<result>B</result>
The radius of a sphere is increased by 50%. The increase in surface area of the sphere is :