-90.24% is the change from 871 to 85
Calculation steps:
[( 85 - 871 ) ÷ 871] x 100 = -90.24%
Formula
Percentage change = [(85 - 871) / 871] x 100
Subtract the new number by the original number
85 - 871 = -786
-786 ÷ 871 = -0.9024110218140069
-0.9024110218140069 x 100 = -90.24%