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It depends on the grading scale. 47/50 is 94% which is an A in most cases.
20-3 = 17 and 17/20 = 85/100 = .85 or 85%. Percent is a ratio per cent or 100. Multiplying both the 20 and the 17 by 5 will make the denominator 100 and the percent sought after.
That is about a "C".
As a percentage it is 80%
77% or C+