The registration area has just opened at a large convention of building contractors in Banff. There are people arriving per hour (Poisson distributed), and the cost of their waiting time in the queue is valued at $ per person per hour. The local convention bureau provides servers to register guests at a fee of $ per person per hour. It takes about minute(s) to register an attendee (exponentially distributed). A single waiting line, with multiple servers, is set up. Part 2 a) What is the minimum number of servers for this system? The minimum number of registration desks that need to be opened for processing the attendees is 4. (Enter your response as a whole number.) Part 3 b) What is the optimal number of servers for this system? The optimal number of servers is 7. (Enter your response as a whole number.) Part 4 c) What is the cost for the system, per hour, at the optimum number of servers? For the optimum number of servers, the total cost per hour is $ 167. (Enter your response rounded to the nearest dollar.) Part 5 d) What is the server utilization rate with the minimum number of servers? For the minimum number of servers, the utilization rate = enter your response here%. (Enter your response rounded to two decimal places.)