19 to 31 is a 63.1579% increase.
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The percent of increase from 19 to 38 is: 100%
26.67% increase.
The increase from 8 to 19 is: 137.5%
This is an increase of 106.7%
percent increase = (new amount - original amount)/original amount = (39 - 20)/20 = 19/20 Increase is 19/20, ie 95%