-40% is the change from 975 to 585
Calculation steps:
[( 585 - 975 ) ÷ 975] x 100 = -40%
Formula
Percentage change = [(585 - 975) / 975] x 100
Subtract the new number by the original number
585 - 975 = -390
-390 ÷ 975 = -0.4
-0.4 x 100 = -40%
Example