255.08% is the change from 256 to 909
Calculation steps:
[( 909 - 256 ) ÷ 256] x 100 = 255.08%
Formula
Percentage change = [(909 - 256) / 256] x 100
Subtract the new number by the original number
909 - 256 = 653
653 ÷ 256 = 2.55078125
2.55078125 x 100 = 255.08%