53.52% is the change from 256 to 393
Calculation steps:
[( 393 - 256 ) ÷ 256] x 100 = 53.52%
Formula
Percentage change = [(393 - 256) / 256] x 100
Subtract the new number by the original number
393 - 256 = 137
137 ÷ 256 = 0.53515625
0.53515625 x 100 = 53.52%