3985% is the change from 20 to 817
Calculation steps:
[( 817 - 20 ) ÷ 20] x 100 = 3985%
Formula
Percentage change = [(817 - 20) / 20] x 100
Subtract the new number by the original number
817 - 20 = 797
797 ÷ 20 = 39.85
39.85 x 100 = 3985%
Example