-88.67% is the change from 821 to 93
Calculation steps:
[( 93 - 821 ) ÷ 821] x 100 = -88.67%
Formula
Percentage change = [(93 - 821) / 821] x 100
Subtract the new number by the original number
93 - 821 = -728
-728 ÷ 821 = -0.8867235079171741
-0.8867235079171741 x 100 = -88.67%