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40, as a percentage of 80 is 100*40/80 = 50%
12 over 50 as a percent is 24%.
40/50 x 100 = 80 percent.
50% of 80 = 40 because 50% = 0.5 0.5 x 80 = 40 or you can divide 40 by 0.5 40/0.5 = 80
80%=80/100 80/100 x 50 questions = 40 correct answers. therefore 50 - 40 = 10 incorrect answers.