Wichita's famous Sethi Restaurant is open 24 hours a day. Servers report for duty at 3 A.M., 7 A.M., 11 A.M., 3 P.M., 7 P.M., or 11 P.M., and each works an 8-hour shift. The following table shows the minimum number of workers needed during the 6 periods into which the day is divided: Decision vairable: X₁ = number of workers reporting for the start of working period i, where i = 1, 2, 3, 4, 5, or 6. Objective function: Minimize Z= Subject to: Owner Avanti Sethi's scheduling problem is to determine how many servers should report for work at the start of each time period in order to minimize the total staff required for one day's operation. (Hint: Let X; equal the number of servers beginning work in time period i, where i = 1, 2, 3, 4, 5, 6.) X₁ + X₂ + X3 + X4+ X5 + X6 + For all X, 20 212 ▼215 ▼≥10 ▼≥13 ▼24 ▼24 Period 1 2 3 4 5 6 Time 3 A.M. - 7 A.M. 7 A.M. - 11 A.M. 11 A.M. - 3 P.M. 3 P.M. - 7 P.M. 7 P.M. - 11 P.M. 11 P.M. - 3 A.M. (7 A.M. - 11 A.M.) (11 A.M. - 3 P.M.) (3 P.M. - 7 P.M.) Number of Servers Required 4 12 15 10 13 4 (7 P.M. - 11 P.M.) (11 P.M. - 3 A.M.) (3 A.M. - 7 A.M.)
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- The Tinkan Company produces one-pound cans for the Canadian salmon industry. Each year the salmon spawn during a 24-hour period and must be canned immediately. Tinkan has the following agreement with the salmon industry. The company can deliver as many cans as it chooses. Then the salmon are caught. For each can by which Tinkan falls short of the salmon industrys needs, the company pays the industry a 2 penalty. Cans cost Tinkan 1 to produce and are sold by Tinkan for 2 per can. If any cans are left over, they are returned to Tinkan and the company reimburses the industry 2 for each extra can. These extra cans are put in storage for next year. Each year a can is held in storage, a carrying cost equal to 20% of the cans production cost is incurred. It is well known that the number of salmon harvested during a year is strongly related to the number of salmon harvested the previous year. In fact, using past data, Tinkan estimates that the harvest size in year t, Ht (measured in the number of cans required), is related to the harvest size in the previous year, Ht1, by the equation Ht = Ht1et where et is normally distributed with mean 1.02 and standard deviation 0.10. Tinkan plans to use the following production strategy. For some value of x, it produces enough cans at the beginning of year t to bring its inventory up to x+Ht, where Ht is the predicted harvest size in year t. Then it delivers these cans to the salmon industry. For example, if it uses x = 100,000, the predicted harvest size is 500,000 cans, and 80,000 cans are already in inventory, then Tinkan produces and delivers 520,000 cans. Given that the harvest size for the previous year was 550,000 cans, use simulation to help Tinkan develop a production strategy that maximizes its expected profit over the next 20 years. Assume that the company begins year 1 with an initial inventory of 300,000 cans.4. The Spencer Optics Company produces an inexpensive line of sunglasses. The manufacturing process consists of assembling two plastic lenses (produced by the firm's plastic molding depart- ment) into a finished frame (purchased from an outside supplier). The company is interested in using material requirements planning to schedule its operations and has asked you to prepare an example to illustrate the technique. The firm's sales manager has prepared a 10-week sales forecast for one of the more popular sunglasses (the Classic model) for your example. The forecast is 100 units per week. Spencer has customer orders of 110 units, 80 units, 50 units, and 20 units in weeks 1, 2, 3, and 4, respectively. The sunglasses are assembled in batches of 300 units. Presently, three such batches are sched- uled: one in week 2, one in week 5, and one in week 8. Complete the following time-phased record: Week hand 1 2 3 4 5 6 7 8 9 10 Classic Model On MPS Record Forecast Orders Projected available…QuestionByron Sports is a manufacturer of sportswear. It produces all of its products in one department using a process costing system.The information for the current month is as follows:Beginning work in process (30% complete as to conversion cost) 12,000 unitsUnits started 90,000 unitsUnits completed and transferred out ?Ending work in process (70% complete as to conversion) 8,000 unitsCosts:Beginning work-in-process direct materials $28,800Beginning work-in-process conversion $5,040Direct materials added during month $216,000Conversion costs incurred during the month $139,200Direct materials are added at the beginning of the process. Conversion costs are incurred uniformlythroughout the production process. Costing is handled on a FIFO basis Required:a. Prepare a production cost worksheet using 5 steps approach.b. Under what conditions would a process costing system be more appropriate than a job order costing system? Explain.
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- Create a Crow’s Foot notation ERD to support the following business operations: Create a Crowsfoot notation ERD to support the following business operations: - A friend of yours has opened Marshfield Electronics and Repairs (MER) to repair smartphones, laptops, tablets, and MP3 players. She wants you to create a database to help her run her business. When a customer brings a device to MER for repair, data must be recorded about the customer, the device, and the repair (also referred to as repair request). Completing each repair request can involve multiple services (e.g. glass replacement, battery replacement, cleaning. Some services require parts. The customer’s name, address, and a contact phone number must be recorded. For the device to be repaired, the type of device, model, and serial number are recorded (or verified if the device is already in the system). Each repair request is given a reference number, which is recorded in the system along with the date of the request, and a…Solve the question below using the attached excel templates with formulas for renting both slow and fast copies (labeled in the excel tabs). Question: The Decision Sciences Department is trying to determine whether to rent a slow or a fast copier. The department believes that an employee’s time is worth $15 per hour. The slow copier rents for $4 per hour, and it takes an employee an average of 10 minutes to complete copying. The fast copier rents for $15 per hour, and it takes an employee an average of six minutes to complete copying. On average, four employees per hour need to use the copying machine. (Assume the copying times and interarrival times to the copying machine are exponentially distributed.) Which machine should the department rent to minimize expected total cost per hour?4. The seven-person maintenance function at a hospital performs both preventive and corrective maintenance on hundreds of items each month, All the workers are scheduled for 40 hours per week and there are four weeks in a month. It is the goal of the maintenance department to achieve 90% utilization with a mix of two-thirds preventive maintenance and one-third corrective maintenance, How many hours each month are spent performing preventive maintenance if they achieve their 90% utilization and correct/preventive mix targets?
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