-39.81% is the change from 648 to 390
Calculation steps:
[( 390 - 648 ) ÷ 648] x 100 = -39.81%
Formula
Percentage change = [(390 - 648) / 648] x 100
Subtract the new number by the original number
390 - 648 = -258
-258 ÷ 648 = -0.39814814814814814
-0.39814814814814814 x 100 = -39.81%