Jill and Bert both produce nuts and coffee. They each prefer to consume a diet that is half nuts and half coffee. Both have access to the same resources. If Jill focuses on producing only coffee, she can produce 20 pounds of coffee in a week. If she only produces nuts, she can produce 40 pounds of nuts in a week. Bert can produce a maximum of 15 pounds of coffee in a week. He could also choose to produce only nuts, in which case he can produce 20 pounds of nuts a week. Required: a. Who has an absolute advantage in coffee production? b. Who has an absolute advantage in nut production?