The radius of a circle is increased by 1%. Find how much % does its area increases?  Options
A) 2.07%  B) 2.71%  C) 2.09%  D) 2.01%  E) 1.01%
r = 100 r = 101   r2 = 10000 r2 = 10201   10000 ---- 201   100 ---- ? =&gt; 2.01%   Answer:2.01%
<result>D</result>
The radius of a circle is increased by 1%. Find how much % does its area increases?