-20% is the change from 495 to 396
Calculation steps:
[( 396 - 495 ) ÷ 495] x 100 = -20%
Formula
Percentage change = [(396 - 495) / 495] x 100
Subtract the new number by the original number
396 - 495 = -99
-99 ÷ 495 = -0.2
-0.2 x 100 = -20%
Example