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30 percent of 40 is 12 because you are just multiplying 3/10 by 40/1, which is 12.
3/40 = 7.5%
100% = 4000 1% = 4000/100 = 40 3% = 40 x 3 = 120
66.6% (2/3 ) To find the percent, divide the 40 by 60 and multiply the result by 100.
15/40 = (3x5)/(8x5) = 3/8