-97.05% is the change from 305 to 9
Calculation steps:
[( 9 - 305 ) ÷ 305] x 100 = -97.05%
Formula
Percentage change = [(9 - 305) / 305] x 100
Subtract the new number by the original number
9 - 305 = -296
-296 ÷ 305 = -0.9704918032786886
-0.9704918032786886 x 100 = -97.05%