-10.36% is the change from 878 to 787
Calculation steps:
[( 787 - 878 ) ÷ 878] x 100 = -10.36%
Formula
Percentage change = [(787 - 878) / 878] x 100
Subtract the new number by the original number
787 - 878 = -91
-91 ÷ 878 = -0.10364464692482915
-0.10364464692482915 x 100 = -10.36%