137.5% is the change from 256 to 608
Calculation steps:
[( 608 - 256 ) ÷ 256] x 100 = 137.5%
Formula
Percentage change = [(608 - 256) / 256] x 100
Subtract the new number by the original number
608 - 256 = 352
352 ÷ 256 = 1.375
1.375 x 100 = 137.5%
Example