15% is the change from 720 to 828
Calculation steps:
[( 828 - 720 ) ÷ 720] x 100 = 15%
Formula
Percentage change = [(828 - 720) / 720] x 100
Subtract the new number by the original number
828 - 720 = 108
108 ÷ 720 = 0.15
0.15 x 100 = 15%
Example