-99.2% is the change from 879 to 7
Calculation steps:
[( 7 - 879 ) ÷ 879] x 100 = -99.2%
Formula
Percentage change = [(7 - 879) / 879] x 100
Subtract the new number by the original number
7 - 879 = -872
-872 ÷ 879 = -0.9920364050056882
-0.9920364050056882 x 100 = -99.2%