What's wrong with this expression in a query?

[djclntn]

Ok, I made some time.

In my DailyTask Table I created a Markup Field.

Here the expression I tried:
IIf([TDATE]>=12/1/2011,[ProjectID]*1.1,[ProjectID]*[.7%])

I didn't know what to put in the "markup" brackets?

[stevepcne]

Bob:I agree with your reply, thanks for the correction and link.

[djclntn]

I tried:
=iif([TDATE]>=*#*12/1/2011*#*,[ProjectID]*1.10,[ProjectID]*[markup%])

"You may have entered a comma without a proceeding value or identifier"

[boblarson]

I tried:
=iif([TDATE]>=*#*12/1/2011*#*,[ProjectID]*1.10,[ProjectID]*[markup%])

"You may have entered a comma without a proceeding value or identifier"

I'm a little ready to scream ...

Did I have quotes around the # when I posted what I posted? NO I DIDN'T! So why did you add them? WHY???????