If the fictitious country of Islandia puts all of its production resources into fish, it can produce 70 units of fish. If it puts all of its production resources into coconuts, it can produce 35 units of coconuts. If the fictitious country of Mountania puts all of its production resources into fish, it can produce 80 units of fish. If it puts all of its production resources into coconuts, it can produce 60 units of coconuts. Assume that both countries have constant cost functions for both products.