3900% is the change from 18 to 720
Calculation steps:
[( 720 - 18 ) ÷ 18] x 100 = 3900%
Formula
Percentage change = [(720 - 18) / 18] x 100
Subtract the new number by the original number
720 - 18 = 702
702 ÷ 18 = 39
39 x 100 = 3900%
Example