Nancy Grant is the owner of Coal Bank Hollow Recycling, a company that specializes in collecting and recycling paper products. Nancy's company uses two different recycling processes to convert newspaper, mixed paper, white office paper, and cardboard into paper pulp. The amount of paper pulp extracted from the recyclable materials and the cost of extracting the pulp differs depending on which recycling process is used. The following table summarizes the recycling processes: For instance, every ton of newspaper subjected to recycling process 1 costs $13 and yields 0.9 tons of paper pulp. The paper pulp produced by the two different recycling processes goes through other operations to be transformed into pulp for newsprint, packaging paper, or print stock quality paper. The yields associated with transforming the recycled pulp into pulp for the final products are summarized in the following table: For instance, a ton of pulp exiting recycling process 2 can be transformed into 0.95 tons of packaging paper at a cost of $8. Nancy currently has 70 tons of newspaper, 50 tons of mixed paper, 30 tons of white office paper, and 40 tons of cardboard. She has a contract to produce 60 tons of newsprint pulp, 40 tons of packaging paper pulp, and 50 tons of print stock pulp, and wants to determine the most efficient way to meet this obligation.