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At December $31,$ Marker reported the following items: cash, $$7,500$; inventory, $$3,900$; accounts payable, $$5,900$; accounts receivable, $$3,100$; common stock, $$6,000$; property, plant, and equipment, $$10,500$; interest payable, $$1,600$; retained earnings, $$11,500.$

What is the total of Marker's current assets?