-5.35% is the change from 878 to 831
Calculation steps:
[( 831 - 878 ) ÷ 878] x 100 = -5.35%
Formula
Percentage change = [(831 - 878) / 878] x 100
Subtract the new number by the original number
831 - 878 = -47
-47 ÷ 878 = -0.05353075170842825
-0.05353075170842825 x 100 = -5.35%