-25.15% is the change from 342 to 256
Calculation steps:
[( 256 - 342 ) ÷ 342] x 100 = -25.15%
Formula
Percentage change = [(256 - 342) / 342] x 100
Subtract the new number by the original number
256 - 342 = -86
-86 ÷ 342 = -0.25146198830409355
-0.25146198830409355 x 100 = -25.15%