137.78% is the change from 270 to 642
Calculation steps:
[( 642 - 270 ) ÷ 270] x 100 = 137.78%
Formula
Percentage change = [(642 - 270) / 270] x 100
Subtract the new number by the original number
642 - 270 = 372
372 ÷ 270 = 1.3777777777777778
1.3777777777777778 x 100 = 137.78%