-39.91% is the change from 649 to 390
Calculation steps:
[( 390 - 649 ) ÷ 649] x 100 = -39.91%
Formula
Percentage change = [(390 - 649) / 649] x 100
Subtract the new number by the original number
390 - 649 = -259
-259 ÷ 649 = -0.39907550077041604
-0.39907550077041604 x 100 = -39.91%