289.45% is the change from 256 to 997
Calculation steps:
[( 997 - 256 ) ÷ 256] x 100 = 289.45%
Formula
Percentage change = [(997 - 256) / 256] x 100
Subtract the new number by the original number
997 - 256 = 741
741 ÷ 256 = 2.89453125
2.89453125 x 100 = 289.45%