Speedy Oil provides a single-server automobile oil change and lubrication service. Customers provide an arrival rate of 4 cars per hour. The service rate is 5 cars per hour. Assume that arrivals follow a Poisson probability distribution and that service times follow an exponential probability distribution.

we have the following information:

lq = 0.5

wq = 0.20

pw = 0.5

Draw a cost model comparison chart or aspiration level comparison chart (whichever is more convenient)