One wrong out of 40 questions would mean you scored a 39/40. This would be 97.5% (39 ÷ 40 = .975)
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4 out of 10 is 40 percent
One-tenth of 40 is one-tenth times 40.40 x 1/10 = 40 ÷ 10 = 44
87.5%.
If you answered 23 correct out of 40 questions, your percent correct is 57.5%
It is an error rate of 10%.