164.06% is the change from 256 to 676
Calculation steps:
[( 676 - 256 ) ÷ 256] x 100 = 164.06%
Formula
Percentage change = [(676 - 256) / 256] x 100
Subtract the new number by the original number
676 - 256 = 420
420 ÷ 256 = 1.640625
1.640625 x 100 = 164.06%