Determine the average job flow time

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Reference no: EM13736427

a. A machine shop needs to schedule jobs to be processed. Sequence the jobs using the following rules: FCFS, SPT, and EDD. (Assume the list is by order of arrival.) For each rule, determine the average job flow time, the average tardiness, and the average number of jobs at the work center.

Job	Job time (hours)	Due Date (hours from now)
A	7	21
B	10	12
C	3	8
D	9	20
E	15	18

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	FCFS (5 points)	SPT (5 points)	EDD (5 points)	CR (6 points)
Job Sequence
Average job flow time
Average tardiness
Average number of jobs at work center

Which scheduling rule would you recommend and why? (4 points)

B. Peter Pepperoni, owner of the Perfect Pasta Pizza Parlor, uses 25 pounds of pepperoni each day in preparing pizzas. Order costs for pepperoni are $10.00 per order, and carrying costs are 5 cents per pound per day. Lead time for each order is 3 days. Currently, he orders 80 pounds of pepperoni at a time.

a. At what point (inventory level) should he reorder pepperoni? (5 points)

b. What would be the length of an order cycle (in days)? (5 points)

c. What is the average inventory level? (5 points)

d. What is the total daily cost of inventory? (5 points)

e. What is the economic order quantity for pepperoni? (5 points)

f. If he changes to the economic order quantity, what would be the new daily inventory costs? (5 points)

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c. A manager must assign four engineers to projects, one to a project.

	A	B	C	D
Engineer 1	17	11	19	18
Engineer 2	16	17	11	9
Engineer 3	24	27	16	13
Engineer 4	27	17	23	24

a. Given the cost figures below for each project-engineer combination, determine assignments such that total cost will be minimized. (10 points)

b. The leader of Project C has indicated that he does not want engineer 2 or 3 on his project. Rework the assignment problem, keeping in mind that two combinations are undesirable, such that total cost will be minimized. (15 points)

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Engr 1: xx

Engr 2: xx

Engr 3: xx

Engr 4: xx

Cost: xx

Given the following data for a make or buy decision:

Alternative	Fixed Cost	Variable Cost
Buy	$0 per year	$8 per unit
Make	$100,000 per year	$4 per unit

a. What is the total cost to buy a quantity of 15,000 units per year? (2.5 points)

b. What is the total cost to make a quantity of 15,000 units per year? (2.5 points)

c. For what quantity would you be indifferent between buying or making? (2.5 points)

d. Which alternative would you select for a quantity of 24,000 units per year? (2.5 points)

e. What alternative is preferred for 32,000 units per year, and what is the cost? (5 points)

f. What would be your cost savings for the preferred alternative, for 32,000 units per year, compared to the other alternative? (5 points)

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Please use bold text to make your final answer for each part stand out more clearly.

This is the answer done by myself, please don't buy the answer, the answer is wrong.

	FCFS (5 points)	SPT (5 points)	EDD (5 points)	CR (6 points)
Job Sequence	A-B-C-D-E	C-A-D-B-E	C-B-E-D-A	E-D-C-A-B
Average job flow time	23.40	21.00	25.00	28.8
Average tardiness	10.4	8.60	10.20	13.6
Average number of jobs at work center	2.65	2.39	2.84	3.44

Reference no: EM13736427

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