19.14% is the change from 256 to 305
Calculation steps:
[( 305 - 256 ) ÷ 256] x 100 = 19.14%
Formula
Percentage change = [(305 - 256) / 256] x 100
Subtract the new number by the original number
305 - 256 = 49
49 ÷ 256 = 0.19140625
0.19140625 x 100 = 19.14%