90.63% is the change from 256 to 488
Calculation steps:
[( 488 - 256 ) ÷ 256] x 100 = 90.63%
Formula
Percentage change = [(488 - 256) / 256] x 100
Subtract the new number by the original number
488 - 256 = 232
232 ÷ 256 = 0.90625
0.90625 x 100 = 90.63%