-82.91% is the change from 585 to 100
Calculation steps:
[( 100 - 585 ) ÷ 585] x 100 = -82.91%
Formula
Percentage change = [(100 - 585) / 585] x 100
Subtract the new number by the original number
100 - 585 = -485
-485 ÷ 585 = -0.8290598290598291
-0.8290598290598291 x 100 = -82.91%