The data type is 'money'.
SELECT C.DocID,C.KindCode, C.FileNumber,C.Book, C.Page, c.FileDate, c.InstrumentDate,Round (((r.consideration*2,-3)/2)-500)*.0016 AS 'Revenue Tax'
FROM Constant C, ReceiptTransactions R
WHERE c.RecordingNum = r.RecordingNum
AND c.FileDate >='2010-02-10 00:00:00.000'...