Country A has 36,000 units of labor and can produce 2 goods, manufactures and food. A's producers take 3 units of labor to produce one unit of manufactures and 12 units to produce one unit of food. Country B has 55000 units of labor and takes 5 units of labor to produce one unit of manufactures and 2 units to produce one unit of food. What is the price of manufactures in terms of food at which A and B would respectively supply manufactures? What would A export in Adam Smith's world? What is the amount it could supply?