-96.01% is the change from 501 to 20
Calculation steps:
[( 20 - 501 ) ÷ 501] x 100 = -96.01%
Formula
Percentage change = [(20 - 501) / 501] x 100
Subtract the new number by the original number
20 - 501 = -481
-481 ÷ 501 = -0.9600798403193613
-0.9600798403193613 x 100 = -96.01%