12.5% is the change from 256 to 288
Calculation steps:
[( 288 - 256 ) ÷ 256] x 100 = 12.5%
Formula
Percentage change = [(288 - 256) / 256] x 100
Subtract the new number by the original number
288 - 256 = 32
32 ÷ 256 = 0.125
0.125 x 100 = 12.5%
Example