If y > 0, (10y)/20 + (3y)/10 is what percent of y?	Choose the most appropriate option.
A) 40 %  B) 50 %  C) 60 %  D) 70 %  E) 80 %

Rationale: "can be reduced to y / 2 + 3 y / 10 = 4 y / 5 = 80 % e"
Answer: E