If the radius of a circle is increased by 6%, then the area of the circle is increased by ---
A
.36%
B
3.6%
C
6%
D
12.36%
Correct Answer: 12.36%
Area of circle increased by = r + r + r×r100 = radius = 6 + 6 + 6×6100 = 12 + 0·63 = 12·36