-3.42% is the change from 878 to 848
Calculation steps:
[( 848 - 878 ) ÷ 878] x 100 = -3.42%
Formula
Percentage change = [(848 - 878) / 878] x 100
Subtract the new number by the original number
848 - 878 = -30
-30 ÷ 878 = -0.03416856492027335
-0.03416856492027335 x 100 = -3.42%