Achicken farm orders bags of feed from two farmers. store x charges $20 per bag, and store y charges $15 per bag. the farm must obtain at least 60 bags per week to care for the chickens properly. store y can provide a maximum of 40 bags per week, and the farm has committed to buy at least as many bags from store x as from store y. the chicken farm wants to minimize the cost of ordering feed. let x represent the number of bags of feed from store x and y represent the number of bags of feed from store y.