-49.1% is the change from 499 to 254
Calculation steps:
[( 254 - 499 ) ÷ 499] x 100 = -49.1%
Formula
Percentage change = [(254 - 499) / 499] x 100
Subtract the new number by the original number
254 - 499 = -245
-245 ÷ 499 = -0.4909819639278557
-0.4909819639278557 x 100 = -49.1%