9.75% is the change from 800 to 878
Calculation steps:
[( 878 - 800 ) ÷ 800] x 100 = 9.75%
Formula
Percentage change = [(878 - 800) / 800] x 100
Subtract the new number by the original number
878 - 800 = 78
78 ÷ 800 = 0.0975
0.0975 x 100 = 9.75%
Example