3205% is the change from 20 to 661
Calculation steps:
[( 661 - 20 ) ÷ 20] x 100 = 3205%
Formula
Percentage change = [(661 - 20) / 20] x 100
Subtract the new number by the original number
661 - 20 = 641
641 ÷ 20 = 32.05
32.05 x 100 = 3205%
Example