21.94% is the change from 638 to 778
Calculation steps:
[( 778 - 638 ) ÷ 638] x 100 = 21.94%
Formula
Percentage change = [(778 - 638) / 638] x 100
Subtract the new number by the original number
778 - 638 = 140
140 ÷ 638 = 0.219435736677116
0.219435736677116 x 100 = 21.94%