40 out of 50 is 80%. The grade which this represents will depend on grade boundaries which, in turn, will depend on the standardising procedure.
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50% off of 40= 50% discount applied to 40= 40 - (50% * 40)= 40 - (0.50 * 40)= 40 - 20= 20
40% of 50 = 40% * 50 = 0.4 * 50 = 20
50% of £80 = £40 = 50% * £80 = 50%/100% * £80 = £40
It is: 40/50 times 100/1 = 80%
50% of 80= 50% * 80= 0.5 * 80= 4050percent of 80 is equal to 40