If the diameter of circle R is 20% of the diameter of circle S, the area of circle R is what percent of the area of circle S?	Pick one:  A) 5%  B) 10%  C) 15%  D) 14%  E) 4%
Let diameter of circle R , dr = 20   and diameter of circle S , ds = 100   Radius of circle R , Rr = 10   Radius of circle S , Rs = 50   Area of circle R/ Area of circle S = (pi * Rr ^2 ) /( pi * Rs^2 )   = (10/50)^2 = (2/10)^2   =4%   Answer :4%
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If the diameter of circle R is 20% of the diameter of circle S, the area of circle R is what percent of the area of circle S?