-25.58% is the change from 344 to 256
Calculation steps:
[( 256 - 344 ) ÷ 344] x 100 = -25.58%
Formula
Percentage change = [(256 - 344) / 344] x 100
Subtract the new number by the original number
256 - 344 = -88
-88 ÷ 344 = -0.2558139534883721
-0.2558139534883721 x 100 = -25.58%