-9.11% is the change from 867 to 788
Calculation steps:
[( 788 - 867 ) ÷ 867] x 100 = -9.11%
Formula
Percentage change = [(788 - 867) / 867] x 100
Subtract the new number by the original number
788 - 867 = -79
-79 ÷ 867 = -0.09111880046136102
-0.09111880046136102 x 100 = -9.11%