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Part 1 of 2 - Part 1 40.0 Points
This part of the question is based on the following information .
The Schmedley Discount Department Store has approximately 300 customers shopping in its store between 9 A . M . and 5 P . M . on Saturdays . In deciding how many cash registers to keep open each Saturday , Schmedley ’ s manager considers two factors : customer waiting time ( and the associated waiting cost ) and the service costs of employing additional checkout clerks . Checkout clerks are paid an average of $ 8 per hour . When only one is on duty , the waiting time per customer is about 10 minutes ( or hour ); when two clerks are on duty , the average checkout time is 6 minutes per person ; 4 minutes when three clerks are working ; and 3 minutes when four clerks are on duty .
Schmedley ’ s management has conducted customer satisfaction surveys and has been able to estimate that the store suffers approximately $ 10 in lost sales and goodwill for every hour of customer time spent waiting in checkout lines .
1 . The total customer waiting time is __ hours when there is only one clerk , and it will be reduced to only __ hours if there are four clerks . ( Please only enter an integer and include no units .)