-39.81% is the change from 638 to 384
Calculation steps:
[( 384 - 638 ) ÷ 638] x 100 = -39.81%
Formula
Percentage change = [(384 - 638) / 638] x 100
Subtract the new number by the original number
384 - 638 = -254
-254 ÷ 638 = -0.3981191222570533
-0.3981191222570533 x 100 = -39.81%