XYZ corporation, manufacturer of vehicle radiator, has three manufacturing plants located in various parts of Mindanao, namely: Davao City, Pagadian City and Butuan City. At present the three plants have the following available vehicle radiator: Davao City, 200 units; Pagadian City, 600 units, and Butuan City, 600 units. The following customers placed their orders during the period: Customer A, 600 units, customer B, 400 units and customer C, 400 units. In the delivery of the products, the company pays the salary of the three truck drivers for the delivery of the product as follows: driver X, P3,000 per month, driver Y, P2,800 per month, and driver Z, P3,200 per month. The transportation cost per radiator will be as follows: from Davao City to customer A, P5, to customer B, P4 and to customer C, P3; from Pagadian City to customer A, P8, to customer B, P4 and to customer C, P3, and, from Butuan City to customer A, P9, to customer B, P7, and to customer C, P5.