The following is a portion of the condensed income statement for Rowan, Inc., a manufacturer of plastic containers: Net sales $2,460,000 Less: Cost of goods sold: Inventory, January 1 $ 630,000 Net purchases 1,900,000 Inventory, December 31 (690,000 1,840,000 Gross profit $ 620,000 Required: 1. Determine Rowan's inventory turnover