Baggins Adventure Books (BAB) manufacturers kid's books. BAB only has one ongoing job, Job AB-3280. Job AB-3280 is a small batch of 80 books. The per unit cost of the books as of July 31 was $7.00. During the month of August, an additional $310 of direct labor, and $240 in manufacturing overhead was incurred to finish the books. No additional direct materials were needed. Job AB-3280 was finished at the end of the month, but had not yet been sold. What is the final per unit cost for Job AB-3280? Please round your answer to two decimal places.