57.03% is the change from 256 to 402
Calculation steps:
[( 402 - 256 ) ÷ 256] x 100 = 57.03%
Formula
Percentage change = [(402 - 256) / 256] x 100
Subtract the new number by the original number
402 - 256 = 146
146 ÷ 256 = 0.5703125
0.5703125 x 100 = 57.03%