-49.7% is the change from 505 to 254
Calculation steps:
[( 254 - 505 ) ÷ 505] x 100 = -49.7%
Formula
Percentage change = [(254 - 505) / 505] x 100
Subtract the new number by the original number
254 - 505 = -251
-251 ÷ 505 = -0.497029702970297
-0.497029702970297 x 100 = -49.7%