-99% is the change from 501 to 5
Calculation steps:
[( 5 - 501 ) ÷ 501] x 100 = -99%
Formula
Percentage change = [(5 - 501) / 501] x 100
Subtract the new number by the original number
5 - 501 = -496
-496 ÷ 501 = -0.9900199600798403
-0.9900199600798403 x 100 = -99%