-12.27% is the change from 831 to 729
Calculation steps:
[( 729 - 831 ) ÷ 831] x 100 = -12.27%
Formula
Percentage change = [(729 - 831) / 831] x 100
Subtract the new number by the original number
729 - 831 = -102
-102 ÷ 831 = -0.12274368231046931
-0.12274368231046931 x 100 = -12.27%