-55.47% is the change from 878 to 391
Calculation steps:
[( 391 - 878 ) ÷ 878] x 100 = -55.47%
Formula
Percentage change = [(391 - 878) / 878] x 100
Subtract the new number by the original number
391 - 878 = -487
-487 ÷ 878 = -0.5546697038724373
-0.5546697038724373 x 100 = -55.47%