If every question was worth the same credit, then your score was
25.8% wrong
74.2% correct
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84.5% B
It is: 96.77% rounded to two decimal places
% rate:= (31/105) x 100%= 0.2952 x 100%= 29.52%
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.
100 - 69 = 31, and it's percent, so it's .31 .31*30 = 9.3, but you must round down or up (down to get more than 69%), so you can miss 9 questions and still fail.