-3.91% is the change from 256 to 246
Calculation steps:
[( 246 - 256 ) ÷ 256] x 100 = -3.91%
Formula
Percentage change = [(246 - 256) / 256] x 100
Subtract the new number by the original number
246 - 256 = -10
-10 ÷ 256 = -0.0390625
-0.0390625 x 100 = -3.91%