Four foods X1, X2, X3, Xq are to be produced. contains 2 units of calories, no vitamins and costs P40 per unit. contains no calorie, 2 units of vitamins and costs P100. contains 1 unit of calorie, 1 unit of vitamins and costs P120 per unit. contains 3 units of calorie, 2 units of vitamins and costs P150 per unit. The minimum calorie requirement is 15 units and the minimum vitamin requirement is 8 units. How much of each food should be produced to satisfy these requirements and to minimize the total cost?