-88.17% is the change from 820 to 97
Calculation steps:
[( 97 - 820 ) ÷ 820] x 100 = -88.17%
Formula
Percentage change = [(97 - 820) / 820] x 100
Subtract the new number by the original number
97 - 820 = -723
-723 ÷ 820 = -0.8817073170731707
-0.8817073170731707 x 100 = -88.17%