-90.94% is the change from 342 to 31
Calculation steps:
[( 31 - 342 ) ÷ 342] x 100 = -90.94%
Formula
Percentage change = [(31 - 342) / 342] x 100
Subtract the new number by the original number
31 - 342 = -311
-311 ÷ 342 = -0.9093567251461988
-0.9093567251461988 x 100 = -90.94%