273.83% is the change from 256 to 957
Calculation steps:
[( 957 - 256 ) ÷ 256] x 100 = 273.83%
Formula
Percentage change = [(957 - 256) / 256] x 100
Subtract the new number by the original number
957 - 256 = 701
701 ÷ 256 = 2.73828125
2.73828125 x 100 = 273.83%