-84.23% is the change from 539 to 85
Calculation steps:
[( 85 - 539 ) ÷ 539] x 100 = -84.23%
Formula
Percentage change = [(85 - 539) / 539] x 100
Subtract the new number by the original number
85 - 539 = -454
-454 ÷ 539 = -0.8423005565862709
-0.8423005565862709 x 100 = -84.23%