Table 4.9 Weekly capacity and unit selling price for the Ilax suppliers. Week 1 Week 2 Week 3 In the Ilax problem, assume that the provision of quartz sand for the next month should be planned on a weekly basis. Furthermore, assume that the capacity and the unit selling cost vary on a weekly basis, according to the values reported in Table 4.9. Formulate the multiperiod version of the Ilax problem, and determine the optimal solution by using the e-constraint method (with the same value of e as the one used in the original Ilax problem; see Section 4.4). How does the new solution differ from the previous one? Supplier Capacity Price Capacity Price (t) ($) (t) ($) 1 3 4 5 830 800 750 650 600 791 860 770 1 150 765 680 795 450 800 799 793 765 772 Capacity Price (t) ($) 910 1 150 950 798 1110 806 700 789 765 756 Week 4 Capacity Price (t) ($) 900 900 1 620 775 1445 805 750 788 769 750 765 803