1. Classic Construction Company specializes in constructing buildings with a period-correct architectural style. Three of their current projects, one in Dallas, one in St. Louis, and one in Atlanta, all require a particular reddish “scratch-faced brick,” which can only be purchased from two suppliers, one based in Newkirk, Ohio and one based in Tulsa, Oklahoma. The unit purchase costs and the availability of bricks at the two locations are given in the table below:

Unit Costs (per brick)		Available Supply
Newkirk	$0.57	95,000 (bricks)
Tulsa	$0.64	78,000 (bricks)

The quantities (“demand”) needed by Classic Construction are given in the table below.

Dallas	St. Louis	Atlanta
57000	44,000	68000

Suppose that shipping costs are assessed per truck. Each truck can carry up to 10,000 bricks. However, if you send a truck with only 5000 bricks from Newkirk to Atlanta, Classic Construction still pays $4000 for the half-loaded truck. The shipping costs per truck and route are given below:

Shipping costs (per Truck)
	Dallas	St. Louis	Atlanta
Newkirk	$3000	$2500	$4000
Tulsa	$1000	$1500	$2500

1. 
   
2. Formulate an Integer Linear Program (ILP) that meets the construction needs of Classic Construction and minimizes the cost of purchasing and shipping.
3. Solve your formulation in Excel and report the optimal purchasing/shipping plan as well as the optimal cost. (Set Optimality Gap to .1%)

Answer rating: 100% (QA)

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