The management of the American Parcel Service terminal in Verona, Wisconsin, is concerned about the amount of time the company's trucks are idle, waiting to be unloaded. The terminal operates with five unloading bays currently. Each bay requires a crew of two employees and each crew costs $40 per hour (i.e., $20/hour per employee). The estimated cost of an idle truck is $50 per hour. Trucks arrive at an average rate of four per hour and the inter-arrival time is exponential. On average, a crew can unload one truck in one hour, with exponential service times. 1. What is the total hourly cost of operating this system?