-3.3% is the change from 908 to 878
Calculation steps:
[( 878 - 908 ) ÷ 908] x 100 = -3.3%
Formula
Percentage change = [(878 - 908) / 908] x 100
Subtract the new number by the original number
878 - 908 = -30
-30 ÷ 908 = -0.03303964757709251
-0.03303964757709251 x 100 = -3.3%