19.75% is the change from 638 to 764
Calculation steps:
[( 764 - 638 ) ÷ 638] x 100 = 19.75%
Formula
Percentage change = [(764 - 638) / 638] x 100
Subtract the new number by the original number
764 - 638 = 126
126 ÷ 638 = 0.1974921630094044
0.1974921630094044 x 100 = 19.75%