-96.41% is the change from 502 to 18
Calculation steps:
[( 18 - 502 ) ÷ 502] x 100 = -96.41%
Formula
Percentage change = [(18 - 502) / 502] x 100
Subtract the new number by the original number
18 - 502 = -484
-484 ÷ 502 = -0.9641434262948207
-0.9641434262948207 x 100 = -96.41%