20400% is the change from 4 to 820
Calculation steps:
[( 820 - 4 ) ÷ 4] x 100 = 20400%
Formula
Percentage change = [(820 - 4) / 4] x 100
Subtract the new number by the original number
820 - 4 = 816
816 ÷ 4 = 204
204 x 100 = 20400%
Example