-89.41% is the change from 85 to 9
Calculation steps:
[( 9 - 85 ) ÷ 85] x 100 = -89.41%
Formula
Percentage change = [(9 - 85) / 85] x 100
Subtract the new number by the original number
9 - 85 = -76
-76 ÷ 85 = -0.8941176470588236
-0.8941176470588236 x 100 = -89.41%