Tracking ECP with Google Analytics
 

Hello,

I am looking for a system to set up in Google Analytics where I can calculate EPC in a funnel where I have a few pages and based on traffic source.

For example, I have these pages setup:
Page 1(landing page) -> Page 2 -> Page 3 -> payment -> Page 4.

For each visit to the landing page, I have UTM tags set with campaign/source/medium, Page 4 will record the sale, and page 4 may not come immediately.

I'd like to know how many sales were resulted because of a particular UTM tags, so that I can find out which traffic source is profitable and how much I can spend on it.

Also, what if Page 4 is on a different domain?

Any suggestions are welcome.

Thanks!