55.47% is the change from 256 to 398
Calculation steps:
[( 398 - 256 ) ÷ 256] x 100 = 55.47%
Formula
Percentage change = [(398 - 256) / 256] x 100
Subtract the new number by the original number
398 - 256 = 142
142 ÷ 256 = 0.5546875
0.5546875 x 100 = 55.47%