-7.86% is the change from 878 to 809
Calculation steps:
[( 809 - 878 ) ÷ 878] x 100 = -7.86%
Formula
Percentage change = [(809 - 878) / 878] x 100
Subtract the new number by the original number
809 - 878 = -69
-69 ÷ 878 = -0.0785876993166287
-0.0785876993166287 x 100 = -7.86%