If y > 0, (6y)/20 + (3y)/10 is what percent of y? Pick.
A) 40 %	B) 50 %	C) 60 %	D) 70 %	E) 80 %

Rationale: "can be reduced to 3 y / 10 + 3 y / 10 = 3 y / 5 = 60 % c"
Answer: C