-50.5% is the change from 503 to 249
Calculation steps:
[( 249 - 503 ) ÷ 503] x 100 = -50.5%
Formula
Percentage change = [(249 - 503) / 503] x 100
Subtract the new number by the original number
249 - 503 = -254
-254 ÷ 503 = -0.5049701789264414
-0.5049701789264414 x 100 = -50.5%