134.38% is the change from 256 to 600
Calculation steps:
[( 600 - 256 ) ÷ 256] x 100 = 134.38%
Formula
Percentage change = [(600 - 256) / 256] x 100
Subtract the new number by the original number
600 - 256 = 344
344 ÷ 256 = 1.34375
1.34375 x 100 = 134.38%