Consider the operation of an Apple Store. On a weekday shift between 10 a.m. and 4 p.m, 6 employees are scheduled to work the showroom floor. A typical customer interaction requires a total of 5 minutes of employee time with the customer regardless of the number of items purchased. In addition, most purchased items must be retrieved from the secured back stocking area, scanned out and bagged. This requires 2 minutes per item purchased. The average number of items purchased by each customer is 1.5. Employees are given a 40-minute lunch break at some point during the shift. What is the maximum capacity of this store in terms of average customers served per hour, if no lunch breaks are taken during the hour