21.83% is the change from 820 to 999
Calculation steps:
[( 999 - 820 ) ÷ 820] x 100 = 21.83%
Formula
Percentage change = [(999 - 820) / 820] x 100
Subtract the new number by the original number
999 - 820 = 179
179 ÷ 820 = 0.21829268292682927
0.21829268292682927 x 100 = 21.83%