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Computation problems (25%) 26. (18 points) Consider the following 4 jobs A,B,C,D, which will process in Machine Center X and then process in Machine Center Y. The processing time (in hours) and due date (in hours) are shown below. Machine Centers X and Y have 8 hours of capacity per day. One day is needed to move jobs from Machine Center X to Machine Center Y. a) If jobs are scheduled based on the earliest due day rule, which job(s) can be completed before due date, and which job(s) will not? b) If jobs are scheduled based on the Critical Ratio rule, which job(s) can be completed before due date, and which job(s) will not? c) If jobs are scheduled by the following rule: Schedule the job with the shortest processing time in Machine Center x first, and schedule the job with the shortest processing time in Machine Center Y last. (If there is a tie, randomly pick one.) Continue schedule jobs in this fashion until all jobs are scheduled. What will be the schedule based on this rule? Which job(s) can be completed before due date, and which job(s) will not? 27. (7 points) Given the following information: 1. Lead time demand of an item follows a Normal distribution with a mean 600 pounds and a standard deviation 52 pounds. 2. Accepted stockout risk for this item during the lead time is 4%. a) What amount of safety stock is appropriate? b) When should this item be reordered? Computation problems (25%) 26. (18 points) Consider the following 4 jobs A,B,C,D, which will process in Machine Center X and then process in Machine Center Y. The processing time (in hours) and due date (in hours) are shown below. Machine Centers X and Y have 8 hours of capacity per day. One day is needed to move jobs from Machine Center X to Machine Center Y. a) If jobs are scheduled based on the earliest due day rule, which job(s) can be completed before due date, and which job(s) will not? b) If jobs are scheduled based on the Critical Ratio rule, which job(s) can be completed before due date, and which job(s) will not? c) If jobs are scheduled by the following rule: Schedule the job with the shortest processing time in Machine Center x first, and schedule the job with the shortest processing time in Machine Center Y last. (If there is a tie, randomly pick one.) Continue schedule jobs in this fashion until all jobs are scheduled. What will be the schedule based on this rule? Which job(s) can be completed before due date, and which job(s) will not? 27. (7 points) Given the following information: 1. Lead time demand of an item follows a Normal distribution with a mean 600 pounds and a standard deviation 52 pounds. 2. Accepted stockout risk for this item during the lead time is 4%. a) What amount of safety stock is appropriate? b) When should this item be reordered

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