A company is considering replacing an old piece of machinery, which cost $600,000 and has $350,000 of accumulated depreciation to date, with a new machine that has a purchase price of $545,000. The old machine could be sold for $231,000. The annual variable production costs associated with the old machine are estimated to be $61,000 per year for eight years. The annual variable production costs for the new machine are estimated to be $19,000 per year for eight years. What is the sunk cost in this situation?