Cathy D owns Balloons LLC and must fill balloons with helium and assemble them into certain configurations today for six major parties. Her six customer jobs all need to use the same helium tank, (that is, the single processor), and she was wondering what might be the best way to sequence these jobs. Client (job) number 5 is the top customer. The assistant store manager wants to process them in sequential order, (1, 2, 3, 4, 5, and 6). Since the balloons lose air quickly, the company waits until the day of the parties to fill them and then the workload is hectic. Business is booming and growing about 15 percent per year in their new store location. The job processing times are as follows:

1. Compute the average flow time, lateness, and tardiness for this group of jobs using the assistant store manager's sequential order of 1 (first), 2, 3, 4, 5, and 6 (last).
2. In what order would the jobs be processed using the SPT rule? Compute the average flow time, lateness, and tardiness for this group of jobs.
3. Compare your answers in part 1 & 2

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4 90 Job Processing time (min) Due dates (6 a.m. to midnight in minutes from opening) 3 5 165 170 240 130 210 240 480 720 360 240 780