-29.6% is the change from 831 to 585
Calculation steps:
[( 585 - 831 ) ÷ 831] x 100 = -29.6%
Formula
Percentage change = [(585 - 831) / 831] x 100
Subtract the new number by the original number
585 - 831 = -246
-246 ÷ 831 = -0.296028880866426
-0.296028880866426 x 100 = -29.6%