33.59% is the change from 256 to 342
Calculation steps:
[( 342 - 256 ) ÷ 256] x 100 = 33.59%
Formula
Percentage change = [(342 - 256) / 256] x 100
Subtract the new number by the original number
342 - 256 = 86
86 ÷ 256 = 0.3359375
0.3359375 x 100 = 33.59%