10-14. Warehouse allocation. Consider the case of 4 warehouses and 5 stores. The fixed cost of opening a warehouse is 20 ($ thousand). The transportation cost, cij, of shipments between the warehouses and the stores is summarized in Table 10.21. Table 10.21 Data for Problem 10-14 Cij j 1 2 3 4 5 i 1 10 15 20 9 40 2 12 17 15 20 10 3 18 14 10 35 16 4 9 12 33 28 19 (a) Formulate the problem as an ILP, and find the optimum solution (using AMPL or Solver). (b) Solve the problem using TS with a tabu tenure period of two iterations.