-90.79% is the change from 923 to 85
Calculation steps:
[( 85 - 923 ) ÷ 923] x 100 = -90.79%
Formula
Percentage change = [(85 - 923) / 923] x 100
Subtract the new number by the original number
85 - 923 = -838
-838 ÷ 923 = -0.9079089924160346
-0.9079089924160346 x 100 = -90.79%