3. In one period, Country A can either produce l units of cotton, or 40 units of corn, and Country B can either produce lllll units of cotton or 20 units of corn. Given this information, answer both of the following questions below (note: rounttyonr answers to the nearest tenth). Country A: (a) The opportunity cost of producing each additional unit of cotton is units of corn (In) The opportunity cost of producing each additional unit of corn is units of cotton Country B: (c) The opportunity cost of producing each additional unit of cotton is units of corn. (d) The opportunity cost of producing each additional unit of corn is units of cotton