The following cost information is available for the fast-food franchise in Problem 22:
• Customer waiting time is valued at $25 per hour to reflect the fact that waiting time is costly to the fast-food business.
• The cost of each employee is $6.50 per hour.
• To account for equipment and space, an additional cost of $20 per hour is attributable to each channel. What is the lowest-cost design for the fast-food business?