See how these calculations work:
39-30=9
9/30=.3=30%
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39 / .30 = 130
30 percent 130 = 39
Percent Increase = (Final - Initial) / Initial So Percent Increase from 20 to 39 is (39 - 20)/20 19/20, which is 95%
Percentage change: 680.0% increase
95% increase