7.81% is the change from 256 to 276
Calculation steps:
[( 276 - 256 ) ÷ 256] x 100 = 7.81%
Formula
Percentage change = [(276 - 256) / 256] x 100
Subtract the new number by the original number
276 - 256 = 20
20 ÷ 256 = 0.078125
0.078125 x 100 = 7.81%
Example