-6.84% is the change from 585 to 545
Calculation steps:
[( 545 - 585 ) ÷ 585] x 100 = -6.84%
Formula
Percentage change = [(545 - 585) / 585] x 100
Subtract the new number by the original number
545 - 585 = -40
-40 ÷ 585 = -0.06837606837606838
-0.06837606837606838 x 100 = -6.84%