2. Karen manages a small fishing fleet, which currently consists of three boats. The table below describes the relationship between the number of boats launched and the average daily revenue per boat generated from selling the fish that are caught. Number Daily average of boats benefit ($/boat) 0 0 1 300 2 240 3 200 4 160 Karen's current daily costs of operations, including boat rentals and fisher's wages, are $300, or an average of $100 per boat launched. If she launches a fourth boat, her daily costs of operations will increase to $400, still with an average of $100 per boat launched. How many boats should Karen launch? Explain.