-90.32% is the change from 878 to 85
Calculation steps:
[( 85 - 878 ) ÷ 878] x 100 = -90.32%
Formula
Percentage change = [(85 - 878) / 878] x 100
Subtract the new number by the original number
85 - 878 = -793
-793 ÷ 878 = -0.9031890660592256
-0.9031890660592256 x 100 = -90.32%