-97.78% is the change from 405 to 9
Calculation steps:
[( 9 - 405 ) ÷ 405] x 100 = -97.78%
Formula
Percentage change = [(9 - 405) / 405] x 100
Subtract the new number by the original number
9 - 405 = -396
-396 ÷ 405 = -0.9777777777777777
-0.9777777777777777 x 100 = -97.78%