26.17% is the change from 256 to 323
Calculation steps:
[( 323 - 256 ) ÷ 256] x 100 = 26.17%
Formula
Percentage change = [(323 - 256) / 256] x 100
Subtract the new number by the original number
323 - 256 = 67
67 ÷ 256 = 0.26171875
0.26171875 x 100 = 26.17%