If the area of a circle decreases by 30%, then the radius of a circle decreases by Choose the correct choice from the following choices
A) 20 %	B) 16 %	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 − 30 ) % = ( 100 − 10 √ 70 ) % = 100 - 84 = 16 % answer b"
Answer: B