-13.41% is the change from 820 to 710
Calculation steps:
[( 710 - 820 ) ÷ 820] x 100 = -13.41%
Formula
Percentage change = [(710 - 820) / 820] x 100
Subtract the new number by the original number
710 - 820 = -110
-110 ÷ 820 = -0.13414634146341464
-0.13414634146341464 x 100 = -13.41%