-89.94% is the change from 845 to 85
Calculation steps:
[( 85 - 845 ) ÷ 845] x 100 = -89.94%
Formula
Percentage change = [(85 - 845) / 845] x 100
Subtract the new number by the original number
85 - 845 = -760
-760 ÷ 845 = -0.8994082840236687
-0.8994082840236687 x 100 = -89.94%