-80.4% is the change from 495 to 97
Calculation steps:
[( 97 - 495 ) ÷ 495] x 100 = -80.4%
Formula
Percentage change = [(97 - 495) / 495] x 100
Subtract the new number by the original number
97 - 495 = -398
-398 ÷ 495 = -0.804040404040404
-0.804040404040404 x 100 = -80.4%