-8.8% is the change from 909 to 829
Calculation steps:
[( 829 - 909 ) ÷ 909] x 100 = -8.8%
Formula
Percentage change = [(829 - 909) / 909] x 100
Subtract the new number by the original number
829 - 909 = -80
-80 ÷ 909 = -0.08800880088008801
-0.08800880088008801 x 100 = -8.8%