-90.09% is the change from 858 to 85
Calculation steps:
[( 85 - 858 ) ÷ 858] x 100 = -90.09%
Formula
Percentage change = [(85 - 858) / 858] x 100
Subtract the new number by the original number
85 - 858 = -773
-773 ÷ 858 = -0.9009324009324009
-0.9009324009324009 x 100 = -90.09%