Hey suzuki82,
Thanks for the question and being a valued customer.
Cost per Acquisition is a factor of cost not revenue, so the formula we use is Cost(total click cost, so would be average click cost X clicks) divided by conversions, this gives us the actual cost it took to make the conversion, we also have a COS that is the same cost just relative to the product price, let me know if you want to go over these metrics give us a call 1-866-340-6619.
Thanks,
The GoDataFeed Team