Based on the following data for the current year, what is the inventory turnover? Net sales on account during year $517, 500 Cost of merchandise sold during year 450,000 Accounts receivable, beginning of year 50,000 Accounts receivable, end of year 40,000 Inventory, beginning of year 110,000 Inventory, end of year 140,000 a. 7.2 b. 3.6 c. 3.2 d. 4.2