Selecting A Certain Number Of Records?

Hi,

Here is a basic example of the issue I am having:

Table 1 columns - name, address, zipcode, favorite food

For table 2 I want to find how many zipcodes exists and also take 20% of the count

Table 2 columns - based off Table 1 contains zipcode, count(zipcode) as ct, count(zipcode) * .20 as perc_ct

For example:

zipcode ct perc_ct
83746 10 2
93847 20 4

I want to run a query that will pull any 2 records for 83746 and any 4 records for 93847 from Table 1.

Is this possible?