-1.13% is the change from 800 to 791
Calculation steps:
[( 791 - 800 ) ÷ 800] x 100 = -1.13%
Formula
Percentage change = [(791 - 800) / 800] x 100
Subtract the new number by the original number
791 - 800 = -9
-9 ÷ 800 = -0.01125
-0.01125 x 100 = -1.13%