6.64% is the change from 256 to 273
Calculation steps:
[( 273 - 256 ) ÷ 256] x 100 = 6.64%
Formula
Percentage change = [(273 - 256) / 256] x 100
Subtract the new number by the original number
273 - 256 = 17
17 ÷ 256 = 0.06640625
0.06640625 x 100 = 6.64%