255.86% is the change from 256 to 911
Calculation steps:
[( 911 - 256 ) ÷ 256] x 100 = 255.86%
Formula
Percentage change = [(911 - 256) / 256] x 100
Subtract the new number by the original number
911 - 256 = 655
655 ÷ 256 = 2.55859375
2.55859375 x 100 = 255.86%