-87.3% is the change from 504 to 64
Calculation steps:
[( 64 - 504 ) ÷ 504] x 100 = -87.3%
Formula
Percentage change = [(64 - 504) / 504] x 100
Subtract the new number by the original number
64 - 504 = -440
-440 ÷ 504 = -0.873015873015873
-0.873015873015873 x 100 = -87.3%