-89.67% is the change from 823 to 85
Calculation steps:
[( 85 - 823 ) ÷ 823] x 100 = -89.67%
Formula
Percentage change = [(85 - 823) / 823] x 100
Subtract the new number by the original number
85 - 823 = -738
-738 ÷ 823 = -0.8967193195625759
-0.8967193195625759 x 100 = -89.67%