8.59% is the change from 256 to 278
Calculation steps:
[( 278 - 256 ) ÷ 256] x 100 = 8.59%
Formula
Percentage change = [(278 - 256) / 256] x 100
Subtract the new number by the original number
278 - 256 = 22
22 ÷ 256 = 0.0859375
0.0859375 x 100 = 8.59%