21.68% is the change from 821 to 999
Calculation steps:
[( 999 - 821 ) ÷ 821] x 100 = 21.68%
Formula
Percentage change = [(999 - 821) / 821] x 100
Subtract the new number by the original number
999 - 821 = 178
178 ÷ 821 = 0.21680876979293545
0.21680876979293545 x 100 = 21.68%