-30% is the change from 720 to 504
Calculation steps:
[( 504 - 720 ) ÷ 720] x 100 = -30%
Formula
Percentage change = [(504 - 720) / 720] x 100
Subtract the new number by the original number
504 - 720 = -216
-216 ÷ 720 = -0.3
-0.3 x 100 = -30%
Example