-48.07% is the change from 493 to 256
Calculation steps:
[( 256 - 493 ) ÷ 493] x 100 = -48.07%
Formula
Percentage change = [(256 - 493) / 493] x 100
Subtract the new number by the original number
256 - 493 = -237
-237 ÷ 493 = -0.48073022312373226
-0.48073022312373226 x 100 = -48.07%