your grade would be 80% or a B-
an A+
B
12 - 3 = 9 questions correct9/12 = 0.75 which = 75%
it is a 52%
F
60% D
15 out of 20 would be grade of 75 percent.
toget 80% you need .8 x 15 = 12 questions right. That means you can 15-12 = 3 questions wrong
15 questions.
You would have a 60%.
a 93 good job :)