Supervalu, Inc., claims to be the largest publicly held food wholesaler in the United States. In addition to being a food wholesaler, it operates “extreme value retail grocery stores under the name Save A Lot. Most of these discount stores are located in inner city areas not served by others. Whole Food Markets claims to be the worlds largest retailer of natural and organic foods. Unlike Save A Lot stores that focus on low income customers, Whole Foods offers specialty products to customers with sufficient disposable income to spend on such goods. The following data were taken from these companies 2010 annual reports. All dollar amounts are in millions.

Required: 

a. Before performing any calculations, speculate as to which company will have the highest gross margin and return on sales percentage. Explain the rationale for your decision. 
b. Calculate the gross margin percentages for Supervalu and Whole Foods Market. 
c. Calculate the return on sales percentages for Supervalu and Whole Foods Market. 
d. Do the calculations from Requirements b and c confirm your speculations in Requirement a?