-4.1% is the change from 878 to 842
Calculation steps:
[( 842 - 878 ) ÷ 878] x 100 = -4.1%
Formula
Percentage change = [(842 - 878) / 878] x 100
Subtract the new number by the original number
842 - 878 = -36
-36 ÷ 878 = -0.04100227790432802
-0.04100227790432802 x 100 = -4.1%