-24% is the change from 879 to 668
Calculation steps:
[( 668 - 879 ) ÷ 879] x 100 = -24%
Formula
Percentage change = [(668 - 879) / 879] x 100
Subtract the new number by the original number
668 - 879 = -211
-211 ÷ 879 = -0.24004550625711035
-0.24004550625711035 x 100 = -24%