-88.3% is the change from 855 to 100
Calculation steps:
[( 100 - 855 ) ÷ 855] x 100 = -88.3%
Formula
Percentage change = [(100 - 855) / 855] x 100
Subtract the new number by the original number
100 - 855 = -755
-755 ÷ 855 = -0.8830409356725146
-0.8830409356725146 x 100 = -88.3%