21.8% is the change from 821 to 1000
Calculation steps:
[( 1000 - 821 ) ÷ 821] x 100 = 21.8%
Formula
Percentage change = [(1000 - 821) / 821] x 100
Subtract the new number by the original number
1000 - 821 = 179
179 ÷ 821 = 0.21802679658952498
0.21802679658952498 x 100 = 21.8%