77%
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83%
75% or a "C".
If there are 10 questions on the test then they are each worth 10 point to make a total of 100. If you miss one question, then you got 9 right (10 - 1 = 9) so 9 times 10 would be a grade of 90.
To calculate your grade, you divide the number you got correct (9) by the total number of questions (12), which would give you 75%.
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