258.59% is the change from 256 to 918
Calculation steps:
[( 918 - 256 ) ÷ 256] x 100 = 258.59%
Formula
Percentage change = [(918 - 256) / 256] x 100
Subtract the new number by the original number
918 - 256 = 662
662 ÷ 256 = 2.5859375
2.5859375 x 100 = 258.59%