Gildan Activewear Inc. reported the following selected financial information (all in U.S. $ millions): net sales of $1,948 in 2012, $1,726 in 2011, and $1,311 in 2010. The company also reported a profit of $148 in 2012, $234 in 2011, and $198 in 2010. Assets at the end of 2012 were $1,896; at the end of 2011, $1,858; and at the end of 2010, $1,335. (a) Calculate Gildan’s (1) asset turnover, (2) profit margin, and (3) return on assets for 2012 and 2011. (b) Comment on whether the return on assets changed primarily due to a changing asset turnover or a changing profit margin.