If 50% of (x-y) = 20% of (x+y), then what percent of x is y?  Choose the correct answer.
A) 50.5%
B) 42.8%
C) 22.2%
D) 33.3%
E) 25%
50% of (x-y) = 20% of (x+y)   50/100 (x-y) = 20/100 (x+y)   3x = 7y   Required percentage = y/x *100 = 3y/7y * 100 = 42.85%   Answer is 42.8%
<result>B</result>
If 50% of (x-y) = 20% of (x+y), then what percent of x is y?