-50% is the change from 720 to 360
Calculation steps:
[( 360 - 720 ) ÷ 720] x 100 = -50%
Formula
Percentage change = [(360 - 720) / 720] x 100
Subtract the new number by the original number
360 - 720 = -360
-360 ÷ 720 = -0.5
-0.5 x 100 = -50%
Example