-85.14% is the change from 821 to 122
Calculation steps:
[( 122 - 821 ) ÷ 821] x 100 = -85.14%
Formula
Percentage change = [(122 - 821) / 821] x 100
Subtract the new number by the original number
122 - 821 = -699
-699 ÷ 821 = -0.8514007308160779
-0.8514007308160779 x 100 = -85.14%