23.05% is the change from 256 to 315
Calculation steps:
[( 315 - 256 ) ÷ 256] x 100 = 23.05%
Formula
Percentage change = [(315 - 256) / 256] x 100
Subtract the new number by the original number
315 - 256 = 59
59 ÷ 256 = 0.23046875
0.23046875 x 100 = 23.05%