Consider a firm that operates a cannery. All fish brought in by a fleet of fishing boats are processed at the cannery. The firm also has a freezer of unlimited size that stores unprocessed fish. Assume that the freezer is empty in the beginning of the year. There are three seasons. The fleet yields 1800 tons/month during the first third of the year, 2400 tons/month during the middle third, and only 300 tons/month during the final third. The cannery's processing capacity equals 1500 tons/month.

What is the inventory level at the end of January? Please give your answer in tons.