sheila and jim live in a an island where they are the only two workers. Sheila can either catch 10 fish or gather 40 pounds of berries each day, and Jim can catch 8 fish or gather 24 pounds of berries each day. Both of them work 200 day per year. At current world prices of 1 fish trades for 3.5 pounds of berries. Who has the comparative advantage in producing berries?