-39.13% is the change from 828 to 504
Calculation steps:
[( 504 - 828 ) ÷ 828] x 100 = -39.13%
Formula
Percentage change = [(504 - 828) / 828] x 100
Subtract the new number by the original number
504 - 828 = -324
-324 ÷ 828 = -0.391304347826087
-0.391304347826087 x 100 = -39.13%