Assuming that the questions have the same value, each one is worth 1.47 % of the maximum possible score.
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Each question is worth 2.5%
It would depend on the question.
25
To calculate your grade, you need to know how much each question is worth. If each question is worth the same, you can divide the number of correct answers (80 - 3 = 77) by the total number of questions (80) and multiply by 100 to get a percentage. If each question is worth different points, you'll need to know the point value of each question to calculate your grade.
I cannot answer this question. I do not know how much each question is worth.