To 'back-calculate' a percentage such as this, you divide the number by the decimal equivalent of the percentage.
* 40% = 0.4 So, 50 ÷ 0.4 = 125
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50% of 80 = 40 because 50% = 0.5 0.5 x 80 = 40 or you can divide 40 by 0.5 40/0.5 = 80
To find 12.5 percent of a number, multiply the number by 0.125. In this instance, 0.125 x 40 = 5. Therefore, 12.5 percent of 40 is equal to 5.
40/50 x 100 = 80 percent.
40%
To find 40 percent of a number, multiply the number by 0.4. In this instance, 0.4 x 40 = 16. Therefore, 40 percent of 40 is equal to 16.