Cast query result to decimal and return

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C#

LINQ

casting

Sorry a very simple question for more experienced programmers.
How to I cast a linq to sql query to a decimal and return it from a function?

The (decimal) cast below doesn't work.

Thanks for the help!

What I have tried:

static decimal GET_MC_DATA_EAV(int ID, string B_C, string GREEK, int DP_NO)
{

     var qryMC = Globals.DATA.MONTECARLO_EAVs.Where(Z => Z.BOOK_COMP == B_C && Z.BOOK_ID == ID && Z.GREEK == GREEK && Z.DP_NO == DP_NO).Select(Z=>Z.DATA).Single();
           
                  return (decimal)qryMC;    
}