-56.03% is the change from 580 to 255
Calculation steps:
[( 255 - 580 ) ÷ 580] x 100 = -56.03%
Formula
Percentage change = [(255 - 580) / 580] x 100
Subtract the new number by the original number
255 - 580 = -325
-325 ÷ 580 = -0.5603448275862069
-0.5603448275862069 x 100 = -56.03%