-28.63% is the change from 800 to 571
Calculation steps:
[( 571 - 800 ) ÷ 800] x 100 = -28.63%
Formula
Percentage change = [(571 - 800) / 800] x 100
Subtract the new number by the original number
571 - 800 = -229
-229 ÷ 800 = -0.28625
-0.28625 x 100 = -28.63%