The First American Bank of Rapid City has one outside drive‐up teller. It takes the teller an average of 4 minutes to serve a bank customer. Customers arrive at the drive‐up window at a rate of 12 per hour. The bank operation officer is currently analyzing the possibility of adding a second drive‐up window, at an annual cost of $20,000. It is assumed that arriving cars would be equally divided between both windows. The operation officer estimate that each minute’s reduction in customer waiting time would increase the bank’s revenue by $2,000. Should the second drive‐up be installed?