-98.22% is the change from 506 to 9
Calculation steps:
[( 9 - 506 ) ÷ 506] x 100 = -98.22%
Formula
Percentage change = [(9 - 506) / 506] x 100
Subtract the new number by the original number
9 - 506 = -497
-497 ÷ 506 = -0.9822134387351779
-0.9822134387351779 x 100 = -98.22%