-90.77% is the change from 585 to 54
Calculation steps:
[( 54 - 585 ) ÷ 585] x 100 = -90.77%
Formula
Percentage change = [(54 - 585) / 585] x 100
Subtract the new number by the original number
54 - 585 = -531
-531 ÷ 585 = -0.9076923076923077
-0.9076923076923077 x 100 = -90.77%