2.80 to 20 is an increase of 614.3%
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280
The amount of increase is 20. The percent increase is 20/100 X 100 = 20%
10% of 280 pounds would be 28.0 pounds. So 28.0 + 28.0 = 56.0 pounds. 20% of 280 pounds is 56 pounds.
Percent Increase = (Final - Initial) / Initial So Percent Increase from 20 to 39 is (39 - 20)/20 19/20, which is 95%
The percent in the decrease of 25 to 20 = 20%