66.02% is the change from 256 to 425
Calculation steps:
[( 425 - 256 ) ÷ 256] x 100 = 66.02%
Formula
Percentage change = [(425 - 256) / 256] x 100
Subtract the new number by the original number
425 - 256 = 169
169 ÷ 256 = 0.66015625
0.66015625 x 100 = 66.02%