266.41% is the change from 256 to 938
Calculation steps:
[( 938 - 256 ) ÷ 256] x 100 = 266.41%
Formula
Percentage change = [(938 - 256) / 256] x 100
Subtract the new number by the original number
938 - 256 = 682
682 ÷ 256 = 2.6640625
2.6640625 x 100 = 266.41%