3320% is the change from 20 to 684
Calculation steps:
[( 684 - 20 ) ÷ 20] x 100 = 3320%
Formula
Percentage change = [(684 - 20) / 20] x 100
Subtract the new number by the original number
684 - 20 = 664
664 ÷ 20 = 33.2
33.2 x 100 = 3320%
Example