3145% is the change from 20 to 649
Calculation steps:
[( 649 - 20 ) ÷ 20] x 100 = 3145%
Formula
Percentage change = [(649 - 20) / 20] x 100
Subtract the new number by the original number
649 - 20 = 629
629 ÷ 20 = 31.45
31.45 x 100 = 3145%
Example