-2.44% is the change from 900 to 878
Calculation steps:
[( 878 - 900 ) ÷ 900] x 100 = -2.44%
Formula
Percentage change = [(878 - 900) / 900] x 100
Subtract the new number by the original number
878 - 900 = -22
-22 ÷ 900 = -0.024444444444444446
-0.024444444444444446 x 100 = -2.44%