65.63% is the change from 256 to 424
Calculation steps:
[( 424 - 256 ) ÷ 256] x 100 = 65.63%
Formula
Percentage change = [(424 - 256) / 256] x 100
Subtract the new number by the original number
424 - 256 = 168
168 ÷ 256 = 0.65625
0.65625 x 100 = 65.63%