-31.58% is the change from 570 to 390
Calculation steps:
[( 390 - 570 ) ÷ 570] x 100 = -31.58%
Formula
Percentage change = [(390 - 570) / 570] x 100
Subtract the new number by the original number
390 - 570 = -180
-180 ÷ 570 = -0.3157894736842105
-0.3157894736842105 x 100 = -31.58%