An animal food producer mixes two types of animal food: X and Y.Each unit of X costs P100 and contains 40 grams of fat, 20 grams of protein and 1600 calories.Each unit of Y costs P80 and contains 60 grams of fat, 60 grams of protein and 1200 calories.Suppose the producer wants each unit of the final product to yield at least 360 grams of fat, at least 240 grams of protein and at least 9600 calories, how many of each type of grain should the producer use to minimize his cost?