SQL Server 2005 query that uses the IIF with style date bool

Question

Suppose I have TABLE with the following fields:

Quantity [number]

Price [Number]

Returns [bool]

If Returns = true, then - ([quantity]*[Price])// negative returns

If Returns = false, then ([quantity]*[Price]) // positive returns

Question using SQL Server 2005:

Inquiry following his error was in command IIF:

[CODE]

SELECT quantity, Price, Returns, IIF ([Returns] = 0, ([quantity]*[Price]), (-1)*([quantity]*[Price])) As Total

FROM TABLE;

[/CODE]

SQL Syntax Errors Encountered:

The following errors were encountered while parsing the contents of the SQL pane:

Error in list of function arguments: '=' not recognized. Unable to parse query text.