If you missed 12, then you got 31 correct [43-12=31]. If all questions are weighted equally, then 31/43 = 0.721 or 72.1 %, so your grade is 72.
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Providing that the other nine were correct then it is 9/12 which is 75%
93% or A
Just divide 43 by 12. 43 / 12 = . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5833333333333333333333333333333
43 x 12 = 516
F