-50% is the change from 570 to 285
Calculation steps:
[( 285 - 570 ) ÷ 570] x 100 = -50%
Formula
Percentage change = [(285 - 570) / 570] x 100
Subtract the new number by the original number
285 - 570 = -285
-285 ÷ 570 = -0.5
-0.5 x 100 = -50%
Example