-13.75% is the change from 720 to 621
Calculation steps:
[( 621 - 720 ) ÷ 720] x 100 = -13.75%
Formula
Percentage change = [(621 - 720) / 720] x 100
Subtract the new number by the original number
621 - 720 = -99
-99 ÷ 720 = -0.1375
-0.1375 x 100 = -13.75%
Example