Question: Customers arrive at a nationalized bank at the rate of one every 60 ± 40 seconds. 60% of the customers perfonn money transactions and the remaining 40% do other things such as getting the draft, updating passbooks, etc., which require 3 ± 1 and 4 ± 1 minutes, respectively. Currently, there are separate counters for both the activities. Customers feel that if single window concept is introduced, average waiting time could be reduced. Justify by simulating 200 iurivals.