-49.7% is the change from 495 to 249
Calculation steps:
[( 249 - 495 ) ÷ 495] x 100 = -49.7%
Formula
Percentage change = [(249 - 495) / 495] x 100
Subtract the new number by the original number
249 - 495 = -246
-246 ÷ 495 = -0.49696969696969695
-0.49696969696969695 x 100 = -49.7%