21.16% is the change from 638 to 773
Calculation steps:
[( 773 - 638 ) ÷ 638] x 100 = 21.16%
Formula
Percentage change = [(773 - 638) / 638] x 100
Subtract the new number by the original number
773 - 638 = 135
135 ÷ 638 = 0.2115987460815047
0.2115987460815047 x 100 = 21.16%