50.39% is the change from 256 to 385
Calculation steps:
[( 385 - 256 ) ÷ 256] x 100 = 50.39%
Formula
Percentage change = [(385 - 256) / 256] x 100
Subtract the new number by the original number
385 - 256 = 129
129 ÷ 256 = 0.50390625
0.50390625 x 100 = 50.39%