18.81% is the change from 638 to 758
Calculation steps:
[( 758 - 638 ) ÷ 638] x 100 = 18.81%
Formula
Percentage change = [(758 - 638) / 638] x 100
Subtract the new number by the original number
758 - 638 = 120
120 ÷ 638 = 0.18808777429467086
0.18808777429467086 x 100 = 18.81%