Under Armour Inc. is an American supplier of sportswear and casual apparel. Here are selected financial data for the period 2009-2012: 2009 2010 2011 2012 Profit Margin (%) 5.5 6.4 6.6 7.0 Retention Ratio (%) 100.0 100.0 100.0 100.0 Asset Turnover (X) 1.6 1.6 1.6 1.6 Financial Leverage 1.7 1.7 1.9 1.8 (X) Growth Rate in Sales 18.1 24.2 38.4 24.6 (%) Required: a. Calculate Under Armour's annual sustainable growth rate for the years 2009 through 2012 (2 marks) b. Did Under Armour face a growth management challenge during this period? Explain. (2 marks) c. How did Under Armour cope with this challenge? (2 marks) d. What other options are available to Under Armour to manage its growth? Explain. (3 marks)