-7.79% is the change from 770 to 710
Calculation steps:
[( 710 - 770 ) ÷ 770] x 100 = -7.79%
Formula
Percentage change = [(710 - 770) / 770] x 100
Subtract the new number by the original number
710 - 770 = -60
-60 ÷ 770 = -0.07792207792207792
-0.07792207792207792 x 100 = -7.79%