The easiest way would probably be to make a separate page for PPC traffic.
If you don't want to do that, look in your Analytics account and see if you have a beta feature called Advanced Segments.
If you do, then go to the Content section, and then Top Landing Pages and find the page you want to track.
Click on that page. Right under the total visits for that page, you'll see a dropdown that says Analyze: select the Entrance Sources.
You should see a list of sources, like Google, Yahoo, etc.
Then go up to right above the date, and find the Advanced Segments dropdown - it'll probably be defaulted to All Visits. In that dropdown, check Paid and Unpaid Traffic
That should give you the breakdown per source.
Then go to the page you want to analyze, and click on the Advanced Segments dropdown (it's right above the date) and check the segments you want to use - paid and not paid, in your case. Then it will break down each source for