-97.42% is the change from 504 to 13
Calculation steps:
[( 13 - 504 ) ÷ 504] x 100 = -97.42%
Formula
Percentage change = [(13 - 504) / 504] x 100
Subtract the new number by the original number
13 - 504 = -491
-491 ÷ 504 = -0.9742063492063492
-0.9742063492063492 x 100 = -97.42%