A paper recycling company converts newspaper, mixed paper, white office paper, and cardboard into pulp for newsprint, packaging paper, and print stock quality paper. The following table summarizes the yield for each kind of pulp recovered from each ton of recycled material.

For instance, a ton of newspaper can be recycled using a technique that yields 0.85 tons of newsprint pulp. Alternatively, a ton of newspaper can be recycled using a technique that yields 0.80 tons of packaging paper. Similarly, a ton of cardboard can be recycled to yield 0.80 tons of newsprint or 0.70 tons of packaging paper pulp. Note that newspaper and cardboard cannot be converted to print stock pulp using the techniques available to the recycler.
The cost of processing each ton of raw material into the various types of pulp is summarized in the following table along with the amount of each of the four raw materials that can be purchased and their costs.

The recycler wants to determine the least costly way of producing 500 tons of newsprint pulp, 600 tons of packaging paper pulp, and 300 tons of print stock quality pulp.
a. Create a spreadsheet model for this problem and solve it.
b. What is the optimal solution?

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Recycling Yield Packaging 80% 80% 85% 70% Print Stock Newspaper Mixed Paper White Office Paper Cardboard Newsprint 85% 90% 90% 80% 70% 80% Processing Costs per Packa Ton Purchase Cost Per Ton $15 $16 $19 $17 Tons Available 600 500 300 400 Newsprint ging Print Stock Newspaper Mixed Paper White Office Paper Cardboard $6.50 $11.00 9.75 $12.25 $4.75 $7.75 $7.50 $8.50 $9.50 $8.50