-51.72% is the change from 580 to 280
Calculation steps:
[( 280 - 580 ) ÷ 580] x 100 = -51.72%
Formula
Percentage change = [(280 - 580) / 580] x 100
Subtract the new number by the original number
280 - 580 = -300
-300 ÷ 580 = -0.5172413793103449
-0.5172413793103449 x 100 = -51.72%