The difference between 120 and 40 is in magnitude. In terms of dimensions, they are both pure numbers - that is, measures with no dimension.
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40% off of 120 = 72 = 40% discount applied to 120 = 120 - (40% * 120) = 120 - (0.40 * 120) = 120 - 48 = 72
The GCF of 40 and 120 is 40.Since 40 is a factor of 120, it is automatically the GCF.
40% of 120 = 120*40/100 = 48
40% of 120 is 48.
40% of 50% of 120 = (40/100)*(50/100)*120 = 24.