256.64% is the change from 256 to 913
Calculation steps:
[( 913 - 256 ) ÷ 256] x 100 = 256.64%
Formula
Percentage change = [(913 - 256) / 256] x 100
Subtract the new number by the original number
913 - 256 = 657
657 ÷ 256 = 2.56640625
2.56640625 x 100 = 256.64%