266.8% is the change from 256 to 939
Calculation steps:
[( 939 - 256 ) ÷ 256] x 100 = 266.8%
Formula
Percentage change = [(939 - 256) / 256] x 100
Subtract the new number by the original number
939 - 256 = 683
683 ÷ 256 = 2.66796875
2.66796875 x 100 = 266.8%