LA Subway Inc has a promotion that runs all the time where customers get a stamp when they purchase a 12 Inch sub sandwich. For every 10 subs that are purchased the customer receives the 17th sub free of charge Required (5 marks: 1) Does Subway have a single performance obligation or multiple performance obligations with its customers in this revenue arrangement? What is it are they? Describe how the journal entries would be recorded type your answer and submit