-97.88% is the change from 424 to 9
Calculation steps:
[( 9 - 424 ) ÷ 424] x 100 = -97.88%
Formula
Percentage change = [(9 - 424) / 424] x 100
Subtract the new number by the original number
9 - 424 = -415
-415 ÷ 424 = -0.9787735849056604
-0.9787735849056604 x 100 = -97.88%