-31.62% is the change from 585 to 400
Calculation steps:
[( 400 - 585 ) ÷ 585] x 100 = -31.62%
Formula
Percentage change = [(400 - 585) / 585] x 100
Subtract the new number by the original number
400 - 585 = -185
-185 ÷ 585 = -0.3162393162393162
-0.3162393162393162 x 100 = -31.62%