Inventory Ratio Calculations Delroi, Inc. provided the following data for 2008 and 2009: Round all calculations to two decimal places. Calculate the inventory turnover ratio for 2008 and 2009. 2008 times 2009 times Calculate the gross margin return on inventory investment for 2008 and 2009. 2008 2009 The fact that Delroi's inventory levels have fallen over the past two years, while gross margin has increased, is an indication that Delroi is becoming more lean in its operations