The campus bookstore averages 150 customers per day. The store is open for 12 hours per day. Periodically, the store is not able to use the automated credit card machine and the average checkout time increases to 6 minutes. How many checkout lanes should the bookstore have if the manager wants a 30% capacity cushion?
M = ((150 customers/day * 7 minutes/customer)/(12 hours/day * 60 minutes/hour)(1-30/100))
M = 1050/504 = 2.1 or 3 checkout lanes
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