-10.85% is the change from 820 to 731
Calculation steps:
[( 731 - 820 ) ÷ 820] x 100 = -10.85%
Formula
Percentage change = [(731 - 820) / 820] x 100
Subtract the new number by the original number
731 - 820 = -89
-89 ÷ 820 = -0.10853658536585366
-0.10853658536585366 x 100 = -10.85%