-48.18% is the change from 494 to 256
Calculation steps:
[( 256 - 494 ) ÷ 494] x 100 = -48.18%
Formula
Percentage change = [(256 - 494) / 494] x 100
Subtract the new number by the original number
256 - 494 = -238
-238 ÷ 494 = -0.4817813765182186
-0.4817813765182186 x 100 = -48.18%