4080% is the change from 20 to 836
Calculation steps:
[( 836 - 20 ) ÷ 20] x 100 = 4080%
Formula
Percentage change = [(836 - 20) / 20] x 100
Subtract the new number by the original number
836 - 20 = 816
816 ÷ 20 = 40.8
40.8 x 100 = 4080%
Example