Koc logistic firm uses four special tank trucks to deliver three different chemical products to customers. Each tank has four compartments with different capacities:800,950,1200 and 1400 gallons. The daily demand for the three products is estimated at 12,15 and 16 thousand gallons. Any quantities that cannot be delivered by the companys four trucks must be subcontracted at the additional cost of 8,13 and 9 cents per gallon for products 1,2 and 3 respectively. Develop the optimal daily loading schedule for the four trucks that will minimize the additional cost of subcontracting. (please create the ILP model only)