Targeting to promote training

Customer: Why not tell you about how we promoted our own product?and :)

The goal: to gather 25-30 participants for a full audience (using Facebook advertising, mailing, partners free posts).

Cost of the advertising campaign: $47

Input traffic was 113 users with a conversion of 10%.
The price of the click is 0.43$
Three 14 Registration
4 . 11 people came to training through Facebook advertising
5. the price of the lead (the user who left contacts on the landing) - 3.3$,
The cost of the customer is $4.3