If radius of a circle is diminished by 10% then its area is diminished by
Choose the correct choice from the following answers:
A) 22	B) 19	C) 877	D) 26	E) 271

Rationale: explanation : let old radius = 10 units . new radius is diminshed by 10 % . so new radius = 90 % ( 10 ) = 9 units . old area = π × r 2 = 100 π new area = π × 92 = 81 π change = 19 π / 100 π × 100 = 19 % answer : b
Answer: B