80 percent, this is easy, even for a guy who did summer school twice for math related subjects.
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20
100 questions = 20% so 1 question = 20/100 = 0.2%
20 questions = 100% 19.2 questions = 96% its impossible to get 96% on a 20 question test. If you don't get 100%, then the best you can get is 95%.
80 out of 100 is 80/100, so 80%
81.8% 54/66 * 100= % right