40/50 x 100 = 80 percent.
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20/50 = 40/100 = 40%
40, as a percentage of 80 is 100*40/80 = 50%
Repeated proportional change is when you take a percentage of a number (e.g. 80% of 50) and multiply it by a percentage. E.g. 40 is 80% of 50 50 is X% of 40 Find X 40 / 0.8 = 50 50 / 40 = 1.25 1.25 * 100 = 125% X = 125
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
20 is what percent of 50= 20 / 50= 0.4Converting decimal to a percentage:0.4 * 100 = 40%