-8.88% is the change from 878 to 800
Calculation steps:
[( 800 - 878 ) ÷ 878] x 100 = -8.88%
Formula
Percentage change = [(800 - 878) / 878] x 100
Subtract the new number by the original number
800 - 878 = -78
-78 ÷ 878 = -0.0888382687927107
-0.0888382687927107 x 100 = -8.88%