259.38% is the change from 256 to 920
Calculation steps:
[( 920 - 256 ) ÷ 256] x 100 = 259.38%
Formula
Percentage change = [(920 - 256) / 256] x 100
Subtract the new number by the original number
920 - 256 = 664
664 ÷ 256 = 2.59375
2.59375 x 100 = 259.38%