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Sports of All Sorts produces, distributes, and sells high-quality skateboards. Its supply chain consists of three factories (located in Detroit, Los Angeles, and Austin) that

Sports of All Sorts produces, distributes, and sells high-quality skateboards. Its supply chain consists of three factories (located in Detroit, Los Angeles, and Austin) that produce skateboards. The Detroit and Los Angeles facilities can produce 350 skateboards per week, but the Austin plant is larger and can produce up to 700 skateboards per week. Skateboards must be shipped from the factories to one of four distribution centers, or DCs (located in Iowa, Maryland, Idaho, and Arkansas). Each distribution center can process (repackage, mark for sale, and ship) at most 500 skateboards per week.

Factory/DCs Shipping Costs ($ per skateboard)
Iowa 4 Maryland 5 Idaho 6 Arkansas 7
Detroit 1 25.00 25.00 35.00 40.00
Los Angeles 2 35.00 45.00 35.00 42.50
Austin 3 40.00 40.00 42.50 32.50

Skateboards are then shipped from the distribution centers to retailers. Sports of All Sorts supplies three major U.S. retailers: Just Sports, Sports 'N Stuff, and The Sports Dude. The weekly demands are 200 skateboards at Just Sports, 500 skateboards at Sports 'N Stuff, and 650 skateboards at The Sports Dude. The following tables display the per-unit costs for shipping skateboards between the factories and DCs and for shipping between the DCs and the retailers.

Retailers/DCs Shipping Costs ($ per skateboard)
Iowa 4 Maryland 5 Idaho 6 Arkansas 7
Just Sports 8 30.00 20.00 35.00 27.50
Sports 'N Stuff 9 27.50 32.50 40.00 25.00
The Sports Dude 10 30.00 40.00 32.50 42.50

(a) Draw the network representation for this problem.

(b) Build a model to minimize the transportation cost of a logistics system that will deliver skateboards from the factories to the distribution centers and from the distribution centers to the retailers. (Let Detroit be node 1, Los Angeles be node 2, Austin be node 3, Iowa be node 4, Maryland be node 5, Idaho be node 6, Arkansas be node 7, Just Sports be node 8, Sports Stuff be node 9, and Sports Dude be node 10. Express your answers in the form xij where xij represents the number of units shipped from node i to node j.)

Min __________

Detroit Production ___________

Los Angeles Production ___________

Austin Production ___________

Iowa Shipments ___________

Maryland Shipments ___________

Idaho Shipments ___________

Arkansas Shipments ___________

Iowa Processing ___________

Maryland Processing ___________

Idaho Processing ___________

Arkansas Processing ___________

Just Sports Demand ___________

Sports Stuff Demand ___________

Sports Dude Demand ___________

xij 0 for all i and j.

What is the optimal production strategy and shipping pattern for Sports of All Sorts?

Path Units Cost ($)
x14
x15
x16
x17
x24
x25
x26
x27
x34
x35
x36
x37
x48
x49
x410
x58
x59
x510
x68
x69
x610
x78
x79
x710
Totals

What is the minimum attainable transportation cost (in dollars)? $________

(c) Sports of All Sorts is considering expansion of the Iowa DC capacity to 800 units per week. The annual amortized cost of expansion is $40,000. Should the company expand the Iowa DC capacity so that it can process 800 skateboards per week? (Assume 50 operating weeks per year.)

The cost of the optimal solution associated with this increased capacity at the Iowa distribution center is $ _______ per week. Therefore, the potential savings over 50 weeks is 50

( $_______ - $________ ) = $_______ Per Year

The $40,000 cost of expansion (exceeds or does not exceed) the potential savings, so Sports of All Sorts (should or should not) expand.

$ $

= $ per year. The $40,000 cost of expansion ---Select--- exceeds does not exceed the potential savings, so Sports of All Sorts ---Select--- should should not expand.

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