-84.48% is the change from 580 to 90
Calculation steps:
[( 90 - 580 ) ÷ 580] x 100 = -84.48%
Formula
Percentage change = [(90 - 580) / 580] x 100
Subtract the new number by the original number
90 - 580 = -490
-490 ÷ 580 = -0.8448275862068966
-0.8448275862068966 x 100 = -84.48%