If the diameter of circle R is 60% of the diameter of circle S, the area of circle R is what percent of the area of circle S?	Choose the correct choice from the following answers
A) 50 %
B) 46 %
C) 36 %
D) 26 %
E) 38 %

Rationale: let diameter of circle r , dr = 60 and diameter of circle s , ds = 100 radius of circle r , rr = 30 radius of circle s , rs = 50 area of circle r / area of circle s = ( pi * rr ^ 2 ) / ( pi * rs ^ 2 ) = ( 30 / 50 ) ^ 2 = ( 6 / 10 ) ^ 2 = 36 % answer : c
Answer: C