0.78% is the change from 256 to 258
Calculation steps:
[( 258 - 256 ) ÷ 256] x 100 = 0.78%
Formula
Percentage change = [(258 - 256) / 256] x 100
Subtract the new number by the original number
258 - 256 = 2
2 ÷ 256 = 0.0078125
0.0078125 x 100 = 0.78%
Example