53.91% is the change from 256 to 394
Calculation steps:
[( 394 - 256 ) ÷ 256] x 100 = 53.91%
Formula
Percentage change = [(394 - 256) / 256] x 100
Subtract the new number by the original number
394 - 256 = 138
138 ÷ 256 = 0.5390625
0.5390625 x 100 = 53.91%