Based on the following data, what is the amount of working capital? Accounts payable.....$31,000 Accounts receivable.....57,000 Cash.....15,000 Intangible assets.....50,000 Inventory.....69,000 Long-term investments.....80,000 Long-liabilities.....100,000 Marketable securities.....40,000 Notes payable (short-term).....28,000 Land, building, and equipment.....670,000 Prepaid expenses.....1,000