-39.91% is the change from 426 to 256
Calculation steps:
[( 256 - 426 ) ÷ 426] x 100 = -39.91%
Formula
Percentage change = [(256 - 426) / 426] x 100
Subtract the new number by the original number
256 - 426 = -170
-170 ÷ 426 = -0.39906103286384975
-0.39906103286384975 x 100 = -39.91%