-29.52% is the change from 830 to 585
Calculation steps:
[( 585 - 830 ) ÷ 830] x 100 = -29.52%
Formula
Percentage change = [(585 - 830) / 830] x 100
Subtract the new number by the original number
585 - 830 = -245
-245 ÷ 830 = -0.29518072289156627
-0.29518072289156627 x 100 = -29.52%