A poultry raiser wants to mix 2 types of grain: A and B . Each unit of grain A cost 40 pesos and contains 20 grams of fat, 10 grams of protein and 800
calories.Each unit of grain B cost 48 pesos and contains 30 grams of fat, 30 grams of protein and 600 calories. Suppose that the poultry raiser wants each unit of the final product to yield at least 180 grams of fat at least 120 grams of protein and at least 4800 calories. How many units of each type of grain should the poultry raiser use to minimize his cost.