-90.1% is the change from 495 to 49
Calculation steps:
[( 49 - 495 ) ÷ 495] x 100 = -90.1%
Formula
Percentage change = [(49 - 495) / 495] x 100
Subtract the new number by the original number
49 - 495 = -446
-446 ÷ 495 = -0.901010101010101
-0.901010101010101 x 100 = -90.1%