Exclude values from a Bookmark set

[#1]

Hello,

I want to exclude values from a bookmarked set for analysis...

Here's a simple version of my bookmarked set (Set1):

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item           CPM

tee-shirt     $2.40

tee-shirt     $2.45

pencil         $0.30

umbrella     $10.30

-------------------------------

I have an input box that will allow a user to enter a minimum value for analysys.  I've assigned the variable "Set1_MinCPM" to that user entered value.

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Let's say for this example that user entered value is: $2.40

so

Set1_MinCPM = $2.40

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Now I want to count the number of instances where the cost is >= to $2.40... I'm having problems figuring it out. 

This is what I've struggled through so far:

=Count({Set1<CPM={Set1_MinCPM>}CPM)

(count the number of times that the CPM = $2.40) This gives me 0, but it should give me 1

=Count({Set1<CPM={>Set1_MinCPM>}CPM)

(this is just an bad expression)

Any help would be appreciated.

[#2]

So this is working:

=Count({Set1<CPM-={">=3.50"}>}CPM)

but if I substitute a variable for 3.50 I it does not work.

=Count({Set1<CPM-={">=Set1_MinCPM"}>}CPM)

any advice?

[#3]

figured it out::

=Count({Set1<CPM-={"<=$(Set1_MinCPM)">}CPM)