# Formulate and solve an integer programming model to help Rowntown Cab schedule its drivers.

Integer Linear Programming Question: I do need to see the Excel and Solver solutions so I can figure out how to solve this.

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Rowntown Cab Company has 70 drivers that it must schedule in three 8-hour shifts. However, the demand for cabs in the metropolitan area varies dramatically according to time of the day. The slowest period is between midnight and 4:00 A.M. the dispatcher receives few calls, and the calls that are received have the smallest fares of the day. Very few people are going to the airport at that time of the night or taking other long distance trips. It is estimated that a driver will average \$80 in fares during that period. The largest fares result from the airport runs in the morning. Thus, the drivers who sart their shift during the period from 4:00 A.M. to 8:00 A.M. average \$500 in total fares, and drivers who start at 8:00 A.M. average \$420. Drivers who start at noon average \$300, and drivers who start at 4:00 P.M. average \$270. Drivers who start at the beginning of the 8:00 P.M. to midnight period earn an average of \$210 in fares during their 8-hour shift.

To retain customers and acquire new ones, Rowntown must maintain a high customer service level. To do so, it has determined the minimum number of drivers it needs working during every 4-hour time segment- 10 from midnight to 4:00 A.M. 12 from 4:00 to 8:00 A.M. 20 from 8:00 A.M. to noon, 25 from noon to 4:00 P.M., 32 from 4:00 to 8:00 P.M., and 18 from 8:00 P.M. to midnight.

a. Formulate and solve an integer programming model to help Rowntown Cab schedule its drivers.

b. If Rowntown has a maximum of only 15 drivers who will work the late shift from midnight to 8:00 A.M., reformulate the model to reflect this complication and solve it

c. All the drivers like to work the day shift from 8:00 A.M. to 4:00 P.M., so the company has decided to limit the number of drivers who work this 8-hour shift to 20. Reformulate the model in (b) to reflect this restriction and solve it.

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