-50.3% is the change from 501 to 249
Calculation steps:
[( 249 - 501 ) ÷ 501] x 100 = -50.3%
Formula
Percentage change = [(249 - 501) / 501] x 100
Subtract the new number by the original number
249 - 501 = -252
-252 ÷ 501 = -0.5029940119760479
-0.5029940119760479 x 100 = -50.3%