-55.56% is the change from 720 to 320
Calculation steps:
[( 320 - 720 ) ÷ 720] x 100 = -55.56%
Formula
Percentage change = [(320 - 720) / 720] x 100
Subtract the new number by the original number
320 - 720 = -400
-400 ÷ 720 = -0.5555555555555556
-0.5555555555555556 x 100 = -55.56%