-89.06% is the change from 585 to 64
Calculation steps:
[( 64 - 585 ) ÷ 585] x 100 = -89.06%
Formula
Percentage change = [(64 - 585) / 585] x 100
Subtract the new number by the original number
64 - 585 = -521
-521 ÷ 585 = -0.8905982905982905
-0.8905982905982905 x 100 = -89.06%