-87.65% is the change from 251 to 31
Calculation steps:
[( 31 - 251 ) ÷ 251] x 100 = -87.65%
Formula
Percentage change = [(31 - 251) / 251] x 100
Subtract the new number by the original number
31 - 251 = -220
-220 ÷ 251 = -0.8764940239043825
-0.8764940239043825 x 100 = -87.65%