Diet and minimum cost. A group of guinea pigs is to receive 25,600 calories per week. Two available foods produce 200xy calories for a mixture of x kilograms of type M food and y kilograms of type N food. If type M costs $1 per kilogram and type TV costs $2 per kilogram, how much of each type of food should be used to minimize weekly food costs? What is the minimum cost?
x ≥ 0, y ≥ 0