-86.32% is the change from 585 to 80
Calculation steps:
[( 80 - 585 ) ÷ 585] x 100 = -86.32%
Formula
Percentage change = [(80 - 585) / 585] x 100
Subtract the new number by the original number
80 - 585 = -505
-505 ÷ 585 = -0.8632478632478633
-0.8632478632478633 x 100 = -86.32%