-90.68% is the change from 858 to 80
Calculation steps:
[( 80 - 858 ) ÷ 858] x 100 = -90.68%
Formula
Percentage change = [(80 - 858) / 858] x 100
Subtract the new number by the original number
80 - 858 = -778
-778 ÷ 858 = -0.9067599067599068
-0.9067599067599068 x 100 = -90.68%