-98.22% is the change from 507 to 9
Calculation steps:
[( 9 - 507 ) ÷ 507] x 100 = -98.22%
Formula
Percentage change = [(9 - 507) / 507] x 100
Subtract the new number by the original number
9 - 507 = -498
-498 ÷ 507 = -0.9822485207100592
-0.9822485207100592 x 100 = -98.22%