The radius of a sphere is increased by 50%. The increase in surface area of the sphere is : Options
A) 168
B) 125
C) 186
D) 197
E) 191

Rationale: "explanation : take radius 100 . then surface area is 4 × π π × 100 × 100 . after increase radius by 50 % the radius becomes 100 + 50 % of 100 = 150 then new surface area is 4 × π π × 150 × 150 then put the values into formula of percentage = 4 π 1502 − 4 π 10024 π 1002 × 1004 π 1502 − 4 π 10024 π 1002 × 100 = 125 % answer : b"
Answer: B