-90.59% is the change from 85 to 8
Calculation steps:
[( 8 - 85 ) ÷ 85] x 100 = -90.59%
Formula
Percentage change = [(8 - 85) / 85] x 100
Subtract the new number by the original number
8 - 85 = -77
-77 ÷ 85 = -0.9058823529411765
-0.9058823529411765 x 100 = -90.59%