-7.21% is the change from 777 to 721
Calculation steps:
[( 721 - 777 ) ÷ 777] x 100 = -7.21%
Formula
Percentage change = [(721 - 777) / 777] x 100
Subtract the new number by the original number
721 - 777 = -56
-56 ÷ 777 = -0.07207207207207207
-0.07207207207207207 x 100 = -7.21%