-88.19% is the change from 821 to 97
Calculation steps:
[( 97 - 821 ) ÷ 821] x 100 = -88.19%
Formula
Percentage change = [(97 - 821) / 821] x 100
Subtract the new number by the original number
97 - 821 = -724
-724 ÷ 821 = -0.881851400730816
-0.881851400730816 x 100 = -88.19%