-86.88% is the change from 831 to 109
Calculation steps:
[( 109 - 831 ) ÷ 831] x 100 = -86.88%
Formula
Percentage change = [(109 - 831) / 831] x 100
Subtract the new number by the original number
109 - 831 = -722
-722 ÷ 831 = -0.8688327316486161
-0.8688327316486161 x 100 = -86.88%