225.78% is the change from 256 to 834
Calculation steps:
[( 834 - 256 ) ÷ 256] x 100 = 225.78%
Formula
Percentage change = [(834 - 256) / 256] x 100
Subtract the new number by the original number
834 - 256 = 578
578 ÷ 256 = 2.2578125
2.2578125 x 100 = 225.78%