-2.88% is the change from 800 to 777
Calculation steps:
[( 777 - 800 ) ÷ 800] x 100 = -2.88%
Formula
Percentage change = [(777 - 800) / 800] x 100
Subtract the new number by the original number
777 - 800 = -23
-23 ÷ 800 = -0.02875
-0.02875 x 100 = -2.88%