The following data are provided: December 31 2015 2014 Cash $750,000 $500,000 Accounts receivable (net) 800,000 600,000 Inventories 1,300,000 1,100,000 Plant assets (net) 3,500,000 3,250,000 Accounts payable 550,000 400,000 Income taxes payable 100,000 50,000 Bonds payable 700,000 700,000 10% Preferred stock, $50 par 1,000,000 1,000,000 Common stock, $10 par 1,200,000 900,000 Paid-in capital in excess of par 800,000 650,000 Retained earnings 2,000,000 1,750,000 Net credit sales 6,400,000 Cost of goods sold 4,200,000 Operating expenses 1,450,000 Net income 750,000 Additional information: Depreciation included in cost of goods sold and operating expenses is $610,000. On May 1, 2015, 30,000 shares of common stock were issued. The preferred stock is cumulative. The preferred dividends were not declared during 2015.

The accounts receivable turnover for 2015 is

4,200 700.

4,200 800.

6,400 700.

6,400 800.