-80.36% is the change from 504 to 99
Calculation steps:
[( 99 - 504 ) ÷ 504] x 100 = -80.36%
Formula
Percentage change = [(99 - 504) / 504] x 100
Subtract the new number by the original number
99 - 504 = -405
-405 ÷ 504 = -0.8035714285714286
-0.8035714285714286 x 100 = -80.36%