31.25% is the change from 256 to 336
Calculation steps:
[( 336 - 256 ) ÷ 256] x 100 = 31.25%
Formula
Percentage change = [(336 - 256) / 256] x 100
Subtract the new number by the original number
336 - 256 = 80
80 ÷ 256 = 0.3125
0.3125 x 100 = 31.25%
Example