-83.13% is the change from 504 to 85
Calculation steps:
[( 85 - 504 ) ÷ 504] x 100 = -83.13%
Formula
Percentage change = [(85 - 504) / 504] x 100
Subtract the new number by the original number
85 - 504 = -419
-419 ÷ 504 = -0.8313492063492064
-0.8313492063492064 x 100 = -83.13%