3105% is the change from 20 to 641
Calculation steps:
[( 641 - 20 ) ÷ 20] x 100 = 3105%
Formula
Percentage change = [(641 - 20) / 20] x 100
Subtract the new number by the original number
641 - 20 = 621
621 ÷ 20 = 31.05
31.05 x 100 = 3105%
Example