We need to ship a single product from two plants to two warehouses, and then from these two warehouses to three customers. The two plants are p1 and p2. The two plants have the same production costs. The two warehouses are w1 and w2 with identical warehouse handling costs. The three customers are c1, c2 and c3 with demands of 50,000, 100,000 and 50,000, respectively. Products are shipped from the plants to the warehouses, and from the warehouses to the