Single Value from Data Entity - not in entity collection

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Example of a single computed value from database, not a declared entity type


 private decimal getTuneupAmount(DateTime dateCompleted,int classid, int  id)
        {

       string sql = @"SELECT  (count(ow.orderworkid) * (select tuneupamount from mastertable)) as TuneupAmount";
                        sql += " from tbl_o o ";
                        sql += " join tbl_work ow on o.orderid=ow.orderid ";
                        sql += " join _setup s on ow.taskcodenumber=s.TaskCodeNumber and s.typeid =2 ";
                        sql += " WHERE   ow.soldbyid =" + id + "  and ow.solddate ='" + dateCompleted+ "' and o.classcodeid=" + classid + " ";
                        sql += " group by soldbyid,ClassCodeID, ow.solddate";

  var tuneamt = (_dbContextZ.Database.SqlQuery(sql).SingleOrDefault());
                       
        decimal retval = 0;
            if (tuneamt != null)
                        {
                            retval = tuneamt.TuneupAmount.HasValue ? (decimal)tuneamt.TuneupAmount.Value:0;
                        };
          return retval;
                   }

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