-49.41% is the change from 508 to 257
Calculation steps:
[( 257 - 508 ) ÷ 508] x 100 = -49.41%
Formula
Percentage change = [(257 - 508) / 508] x 100
Subtract the new number by the original number
257 - 508 = -251
-251 ÷ 508 = -0.4940944881889764
-0.4940944881889764 x 100 = -49.41%