80%
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toget 80% you need .8 x 15 = 12 questions right. That means you can 15-12 = 3 questions wrong
your grade would be 80% or a B-
10 - 3 = 7 7 / 10 = .7 = 70%
With 3 wrongs out of 8 questions your average is (3/8)x100 = 37.5% wrong and 62.5 correct.
92 :)