-97.43% is the change from 505 to 13
Calculation steps:
[( 13 - 505 ) ÷ 505] x 100 = -97.43%
Formula
Percentage change = [(13 - 505) / 505] x 100
Subtract the new number by the original number
13 - 505 = -492
-492 ÷ 505 = -0.9742574257425742
-0.9742574257425742 x 100 = -97.43%