-88.93% is the change from 280 to 31
Calculation steps:
[( 31 - 280 ) ÷ 280] x 100 = -88.93%
Formula
Percentage change = [(31 - 280) / 280] x 100
Subtract the new number by the original number
31 - 280 = -249
-249 ÷ 280 = -0.8892857142857142
-0.8892857142857142 x 100 = -88.93%