The radius of a circle is increased by 1%. Find how much % does its area increases? Select.
A) 2.21 %  B) 2.07 %  C) 2.08 %  D) 2.01 %  E) 2.11 %

Rationale: r = 100 r = 101 r 2 = 10000 r 2 = 10201 10000 - - - - 201 100 - - - - ? = > 2.01 % answer : d
Answer: D