-87.59% is the change from 685 to 85
Calculation steps:
[( 85 - 685 ) ÷ 685] x 100 = -87.59%
Formula
Percentage change = [(85 - 685) / 685] x 100
Subtract the new number by the original number
85 - 685 = -600
-600 ÷ 685 = -0.8759124087591241
-0.8759124087591241 x 100 = -87.59%