A circular logo is enlarged to fit the lid of a jar. The new diameter is 10 per cent larger than the original. By what percentage has the area of the logo increased?
Choose the correct option.
A) 50	B) 80	C) 100	D) 125	E) 21
Let old diameter be 4 , so radius is 2   Old area = 4π   New diameter is 4.4 , so radius is 2.2   New area = 4.84π   Increase in area is 0.84π   % increase in area = 0.84/4*100   So, % increase is 21%   Answer will be (21)
<result>E</result>
A circular logo is enlarged to fit the lid of a jar. The new diameter is 10 per cent larger than the original. By what percentage has the area of the logo increased?