The following table includes quarterly working capital levels for your firm for the next year. Quarters 4 ($000) Cash Accounts Receivable Inventory Accounts Payable 100 200 200 100 100 100 500 100 100 100 900 100 100 600 50 100 If you want to limit your maximum short-term borrowing to $500,000 and maintain a minimum cash balance of $100,000, how much excess cash must you carry? The excess cash needed is (Round to the nearest dollar.)