-9.23% is the change from 878 to 797
Calculation steps:
[( 797 - 878 ) ÷ 878] x 100 = -9.23%
Formula
Percentage change = [(797 - 878) / 878] x 100
Subtract the new number by the original number
797 - 878 = -81
-81 ÷ 878 = -0.09225512528473805
-0.09225512528473805 x 100 = -9.23%