-6.15% is the change from 878 to 824
Calculation steps:
[( 824 - 878 ) ÷ 878] x 100 = -6.15%
Formula
Percentage change = [(824 - 878) / 878] x 100
Subtract the new number by the original number
824 - 878 = -54
-54 ÷ 878 = -0.06150341685649203
-0.06150341685649203 x 100 = -6.15%