Even if you assume the questions are all worth the same number of marks, the answer may well depend on the grade boundaries.
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If you missed 2 questions out of 7, that means that you got 5 questions out of 7 correct. Divide 5 by 7 and multiply by 100.
5/7 x 100 = 71%
you get an F according to all this math I did. PLease don't edit or change this. The answer is "B", as previously stated.
86% is usually a B.
Assuming that all questions score equally, you can miss out at most 7. And then need to get them all correct.
If you score 7 out of 8 you have a percentage score of 87.5%.
You can miss 40. 80% of 200 = 160 questions right; 40 wrong