-27.79% is the change from 878 to 634
Calculation steps:
[( 634 - 878 ) ÷ 878] x 100 = -27.79%
Formula
Percentage change = [(634 - 878) / 878] x 100
Subtract the new number by the original number
634 - 878 = -244
-244 ÷ 878 = -0.27790432801822323
-0.27790432801822323 x 100 = -27.79%