19.91% is the change from 638 to 765
Calculation steps:
[( 765 - 638 ) ÷ 638] x 100 = 19.91%
Formula
Percentage change = [(765 - 638) / 638] x 100
Subtract the new number by the original number
765 - 638 = 127
127 ÷ 638 = 0.19905956112852666
0.19905956112852666 x 100 = 19.91%