There is a chicken farm. All the chicken in that farm need a total of at least 3 kg of protein, (at least} 12 kg of fat, and [at least) ti kg of ber, to stay healthy. Two brands of foods, A and B, are used to feed the chicken. each kg of brand A contains 10 grams of protein, 25 grams of fat, and 24 grams of ber, each kg of brand B contains 61'.) grams of protein, 5D grams of fat and 8 grams of ber. Each kg of brand A is bought with the cost of MESH, whereas each kg of brand B is bought with the cost of M'. Determine the amount (in kg, decimals allowed) of brand A and brand B needed supply all essential nutrients to the chicken, yet keeping the total cost to the minimum. Also determine such minimum cost (nearest sen)