-27.59% is the change from 580 to 420
Calculation steps:
[( 420 - 580 ) ÷ 580] x 100 = -27.59%
Formula
Percentage change = [(420 - 580) / 580] x 100
Subtract the new number by the original number
420 - 580 = -160
-160 ÷ 580 = -0.27586206896551724
-0.27586206896551724 x 100 = -27.59%