-96.97% is the change from 495 to 15
Calculation steps:
[( 15 - 495 ) ÷ 495] x 100 = -96.97%
Formula
Percentage change = [(15 - 495) / 495] x 100
Subtract the new number by the original number
15 - 495 = -480
-480 ÷ 495 = -0.9696969696969697
-0.9696969696969697 x 100 = -96.97%