98.44% is the change from 256 to 508
Calculation steps:
[( 508 - 256 ) ÷ 256] x 100 = 98.44%
Formula
Percentage change = [(508 - 256) / 256] x 100
Subtract the new number by the original number
508 - 256 = 252
252 ÷ 256 = 0.984375
0.984375 x 100 = 98.44%