-27.68% is the change from 878 to 635
Calculation steps:
[( 635 - 878 ) ÷ 878] x 100 = -27.68%
Formula
Percentage change = [(635 - 878) / 878] x 100
Subtract the new number by the original number
635 - 878 = -243
-243 ÷ 878 = -0.2767653758542141
-0.2767653758542141 x 100 = -27.68%