68.36% is the change from 256 to 431
Calculation steps:
[( 431 - 256 ) ÷ 256] x 100 = 68.36%
Formula
Percentage change = [(431 - 256) / 256] x 100
Subtract the new number by the original number
431 - 256 = 175
175 ÷ 256 = 0.68359375
0.68359375 x 100 = 68.36%