-49.01% is the change from 504 to 257
Calculation steps:
[( 257 - 504 ) ÷ 504] x 100 = -49.01%
Formula
Percentage change = [(257 - 504) / 504] x 100
Subtract the new number by the original number
257 - 504 = -247
-247 ÷ 504 = -0.49007936507936506
-0.49007936507936506 x 100 = -49.01%