-97.44% is the change from 585 to 15
Calculation steps:
[( 15 - 585 ) ÷ 585] x 100 = -97.44%
Formula
Percentage change = [(15 - 585) / 585] x 100
Subtract the new number by the original number
15 - 585 = -570
-570 ÷ 585 = -0.9743589743589743
-0.9743589743589743 x 100 = -97.44%