-79.8% is the change from 495 to 100
Calculation steps:
[( 100 - 495 ) ÷ 495] x 100 = -79.8%
Formula
Percentage change = [(100 - 495) / 495] x 100
Subtract the new number by the original number
100 - 495 = -395
-395 ÷ 495 = -0.797979797979798
-0.797979797979798 x 100 = -79.8%