-96.35% is the change from 849 to 31
Calculation steps:
[( 31 - 849 ) ÷ 849] x 100 = -96.35%
Formula
Percentage change = [(31 - 849) / 849] x 100
Subtract the new number by the original number
31 - 849 = -818
-818 ÷ 849 = -0.9634864546525324
-0.9634864546525324 x 100 = -96.35%