-90.63% is the change from 331 to 31
Calculation steps:
[( 31 - 331 ) ÷ 331] x 100 = -90.63%
Formula
Percentage change = [(31 - 331) / 331] x 100
Subtract the new number by the original number
31 - 331 = -300
-300 ÷ 331 = -0.9063444108761329
-0.9063444108761329 x 100 = -90.63%