-97.79% is the change from 408 to 9
Calculation steps:
[( 9 - 408 ) ÷ 408] x 100 = -97.79%
Formula
Percentage change = [(9 - 408) / 408] x 100
Subtract the new number by the original number
9 - 408 = -399
-399 ÷ 408 = -0.9779411764705882
-0.9779411764705882 x 100 = -97.79%