If Susan takes two tests and makes a makes a 54/100 on the first test and a 63/100 on the second test, and is given a third test and makes an 80/100(which can only count as 20% of her total grade for all three test, what is her final grade/score.

Answer 1

Since the 54% and the 63% grades count as 80% of her grade (and assuming therefore that each counts as 40%), the final grade is

(54+63)(0.4) + 80(.2) = 62.8