-81.28% is the change from 390 to 73
Calculation steps:
[( 73 - 390 ) ÷ 390] x 100 = -81.28%
Formula
Percentage change = [(73 - 390) / 390] x 100
Subtract the new number by the original number
73 - 390 = -317
-317 ÷ 390 = -0.8128205128205128
-0.8128205128205128 x 100 = -81.28%