-9.11% is the change from 878 to 798
Calculation steps:
[( 798 - 878 ) ÷ 878] x 100 = -9.11%
Formula
Percentage change = [(798 - 878) / 878] x 100
Subtract the new number by the original number
798 - 878 = -80
-80 ÷ 878 = -0.09111617312072894
-0.09111617312072894 x 100 = -9.11%