234.38% is the change from 256 to 856
Calculation steps:
[( 856 - 256 ) ÷ 256] x 100 = 234.38%
Formula
Percentage change = [(856 - 256) / 256] x 100
Subtract the new number by the original number
856 - 256 = 600
600 ÷ 256 = 2.34375
2.34375 x 100 = 234.38%