3185% is the change from 20 to 657
Calculation steps:
[( 657 - 20 ) ÷ 20] x 100 = 3185%
Formula
Percentage change = [(657 - 20) / 20] x 100
Subtract the new number by the original number
657 - 20 = 637
637 ÷ 20 = 31.85
31.85 x 100 = 3185%
Example