If y > 0, (2y)/5 + (3y)/10 is what percent of y?
Choose the correct choice from the following:
A) 40 %
B) 50 %
C) 60 %
D) 70 %
E) 80 %

Rationale: can be reduced to 2 y / 5 + 3 y / 10 = 2 y / 5 = 70 % d
Answer: D