It's basically the maximum grade divided by the number of questions.
1.MAX GRADE/NUMBER OF QUESTIONS=AWNSER1
2.AWNSER1xHOW MANY AWNSERS WRONG=AWNSER2
3.100-AWNSER2=YOUR GRADE
You can use this as something pretty useful.
Examples
100/42=2.38095238x5=~~~~~~~~~~~~~~~
And so.
Have a great day!
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