3500% is the change from 20 to 720
Calculation steps:
[( 720 - 20 ) ÷ 20] x 100 = 3500%
Formula
Percentage change = [(720 - 20) / 20] x 100
Subtract the new number by the original number
720 - 20 = 700
700 ÷ 20 = 35
35 x 100 = 3500%
Example