-35% is the change from 900 to 585
Calculation steps:
[( 585 - 900 ) ÷ 900] x 100 = -35%
Formula
Percentage change = [(585 - 900) / 900] x 100
Subtract the new number by the original number
585 - 900 = -315
-315 ÷ 900 = -0.35
-0.35 x 100 = -35%
Example