-63.55% is the change from 878 to 320
Calculation steps:
[( 320 - 878 ) ÷ 878] x 100 = -63.55%
Formula
Percentage change = [(320 - 878) / 878] x 100
Subtract the new number by the original number
320 - 878 = -558
-558 ÷ 878 = -0.6355353075170843
-0.6355353075170843 x 100 = -63.55%