-97.73% is the change from 397 to 9
Calculation steps:
[( 9 - 397 ) ÷ 397] x 100 = -97.73%
Formula
Percentage change = [(9 - 397) / 397] x 100
Subtract the new number by the original number
9 - 397 = -388
-388 ÷ 397 = -0.9773299748110831
-0.9773299748110831 x 100 = -97.73%