250.39% is the change from 256 to 897
Calculation steps:
[( 897 - 256 ) ÷ 256] x 100 = 250.39%
Formula
Percentage change = [(897 - 256) / 256] x 100
Subtract the new number by the original number
897 - 256 = 641
641 ÷ 256 = 2.50390625
2.50390625 x 100 = 250.39%