30 of 40 is 75 percent.
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30 * 40% = 30 * 0.40 = 12
7.5% of 40= 7.5% * 40= 0.075 * 40= 37.5 percent of 40 = 37.5% of 40= 7.5% * 40= 0.075 * 40= 3
30% of 40 as a fraction = 12/1 30% of 40 = 30% * 40 = 30%/100% * 40 = 12/1
25 percent off of 40 is 30.
if you mean 75% of 40: 75% equals 3/4 so 3/4 of 40 is 30; or 30/40