84.5% B
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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.
If every question was worth the same credit, then your score was 25.8% wrong 74.2% correct
6.4516
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.
To find 31 percent of 200 you will solve it like this: 31% of 200 is: 0.31* 200= 62. Using a calculator will also help.