-3.62% is the change from 800 to 771
Calculation steps:
[( 771 - 800 ) ÷ 800] x 100 = -3.62%
Formula
Percentage change = [(771 - 800) / 800] x 100
Subtract the new number by the original number
771 - 800 = -29
-29 ÷ 800 = -0.03625
-0.03625 x 100 = -3.62%