-99.16% is the change from 831 to 7
Calculation steps:
[( 7 - 831 ) ÷ 831] x 100 = -99.16%
Formula
Percentage change = [(7 - 831) / 831] x 100
Subtract the new number by the original number
7 - 831 = -824
-824 ÷ 831 = -0.9915764139590855
-0.9915764139590855 x 100 = -99.16%