4.2% is the same as 0.042 and 0.042*100 = 4.2
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42
20 percent of 42 = 8.4
A percentage is a ratio of the whole of something. The whole being 100%. Therefore 42% is equal to 42/100 which would be 0.42
Divide the something by 100.
80 percent = 0.842 / 0.8 = 52.542 is 5,250 percent of 80 percent.