-49.8% is the change from 496 to 249
Calculation steps:
[( 249 - 496 ) ÷ 496] x 100 = -49.8%
Formula
Percentage change = [(249 - 496) / 496] x 100
Subtract the new number by the original number
249 - 496 = -247
-247 ÷ 496 = -0.49798387096774194
-0.49798387096774194 x 100 = -49.8%