20% is the change from 720 to 864
Calculation steps:
[( 864 - 720 ) ÷ 720] x 100 = 20%
Formula
Percentage change = [(864 - 720) / 720] x 100
Subtract the new number by the original number
864 - 720 = 144
144 ÷ 720 = 0.2
0.2 x 100 = 20%
Example