-2.5% is the change from 720 to 702
Calculation steps:
[( 702 - 720 ) ÷ 720] x 100 = -2.5%
Formula
Percentage change = [(702 - 720) / 720] x 100
Subtract the new number by the original number
702 - 720 = -18
-18 ÷ 720 = -0.025
-0.025 x 100 = -2.5%
Example