150.78% is the change from 256 to 642
Calculation steps:
[( 642 - 256 ) ÷ 256] x 100 = 150.78%
Formula
Percentage change = [(642 - 256) / 256] x 100
Subtract the new number by the original number
642 - 256 = 386
386 ÷ 256 = 1.5078125
1.5078125 x 100 = 150.78%