50.78% is the change from 256 to 386
Calculation steps:
[( 386 - 256 ) ÷ 256] x 100 = 50.78%
Formula
Percentage change = [(386 - 256) / 256] x 100
Subtract the new number by the original number
386 - 256 = 130
130 ÷ 256 = 0.5078125
0.5078125 x 100 = 50.78%