Subject: mathqa
Question: if 30 % of a class averages 95 % on a test , 50 % of the class averages 79 % on the test , and the remainder of the class averages 60 % on the test , what is the overall class average ? ( round final answer to the nearest percent ) .
Option: 
A: 78 %
B: 76 %
C: 77 %
D: 80 %
Answer: D