-28.75% is the change from 800 to 570
Calculation steps:
[( 570 - 800 ) ÷ 800] x 100 = -28.75%
Formula
Percentage change = [(570 - 800) / 800] x 100
Subtract the new number by the original number
570 - 800 = -230
-230 ÷ 800 = -0.2875
-0.2875 x 100 = -28.75%