-90.94% is the change from 331 to 30
Calculation steps:
[( 30 - 331 ) ÷ 331] x 100 = -90.94%
Formula
Percentage change = [(30 - 331) / 331] x 100
Subtract the new number by the original number
30 - 331 = -301
-301 ÷ 331 = -0.9093655589123867
-0.9093655589123867 x 100 = -90.94%