-90.87% is the change from 931 to 85
Calculation steps:
[( 85 - 931 ) ÷ 931] x 100 = -90.87%
Formula
Percentage change = [(85 - 931) / 931] x 100
Subtract the new number by the original number
85 - 931 = -846
-846 ÷ 931 = -0.9087003222341569
-0.9087003222341569 x 100 = -90.87%