-2.23% is the change from 898 to 878
Calculation steps:
[( 878 - 898 ) ÷ 898] x 100 = -2.23%
Formula
Percentage change = [(878 - 898) / 898] x 100
Subtract the new number by the original number
878 - 898 = -20
-20 ÷ 898 = -0.022271714922048998
-0.022271714922048998 x 100 = -2.23%