Tartan Technologies insists on planning on a weekly basis, as they produce 50 weeks out of the year. Tartan Technologies produces three finished goods: the economical model A, the midrange model B, and the deluxe model C. Next year Tartan will produce 500 model Cs, 1000 model Bs, and 2000 model As in total. Tartan usually begins a year by setting up and building model As first and then switches over to build model Bs, before switching over to build model Cs to finish the year. However, the new production manager at Tartan Technologies wants to reform this habit of large batches and to operate with a leaner, mixed-model style of production. Tartan Technologies produces model A and model B at the same speed of 20 units per day; the difference between them is one of materials used, not of complexity of design. Model C, however, uses heavier materi- als and contains more features, so it can be produced at a rate of only 5 units per day. Tar- tan works one 8-hour shift each day; 5 days each week they are open for production.

Questions 

1. Using Tartan's old style of production in batches, how long would Tartan Technolo- gies spend building model B this year, and when would it start on that batch? 

2. If the new production manager changes Tartan's production to a lean mixed-model assembly schedule, how many of each model should Tartan produce each week? 

3. Although Tartan is in the habit of planning everything on a weekly basis, the produc- tion manager knows it is important to find a good daily sequence in mixed-model assembly. What would be a good sequence for Tartan to work through the produc- tion of models A, B, and C each day?