-28.78% is the change from 820 to 584
Calculation steps:
[( 584 - 820 ) ÷ 820] x 100 = -28.78%
Formula
Percentage change = [(584 - 820) / 820] x 100
Subtract the new number by the original number
584 - 820 = -236
-236 ÷ 820 = -0.28780487804878047
-0.28780487804878047 x 100 = -28.78%