-97.35% is the change from 340 to 9
Calculation steps:
[( 9 - 340 ) ÷ 340] x 100 = -97.35%
Formula
Percentage change = [(9 - 340) / 340] x 100
Subtract the new number by the original number
9 - 340 = -331
-331 ÷ 340 = -0.9735294117647059
-0.9735294117647059 x 100 = -97.35%