97.27% is the change from 256 to 505
Calculation steps:
[( 505 - 256 ) ÷ 256] x 100 = 97.27%
Formula
Percentage change = [(505 - 256) / 256] x 100
Subtract the new number by the original number
505 - 256 = 249
249 ÷ 256 = 0.97265625
0.97265625 x 100 = 97.27%