-9.9% is the change from 879 to 792
Calculation steps:
[( 792 - 879 ) ÷ 879] x 100 = -9.9%
Formula
Percentage change = [(792 - 879) / 879] x 100
Subtract the new number by the original number
792 - 879 = -87
-87 ÷ 879 = -0.09897610921501707
-0.09897610921501707 x 100 = -9.9%