If the area of a circle decreases by 25%, then the radius of a circle decreases by
Select
A) 13 %	B) 18 %	C) 36 %	D) 64 %	E) none of these

Rationale: "if area of a circle decreased by x % then the radius of a circle decreases by ( 100 − 10 √ 100 − x ) % = ( 100 − 10 √ 100 − 25 ) % = ( 100 − 10 √ 75 ) % = 100 - 87 = 13 % answer a"
Answer: A