21.32% is the change from 638 to 774
Calculation steps:
[( 774 - 638 ) ÷ 638] x 100 = 21.32%
Formula
Percentage change = [(774 - 638) / 638] x 100
Subtract the new number by the original number
774 - 638 = 136
136 ÷ 638 = 0.21316614420062696
0.21316614420062696 x 100 = 21.32%