2015 13.5% Eisenhower Co. has a storied history, but recently shareholders have been dissatisfied with its anemic growth. Following are data for the period 2015-2019: Profit Margin (%) 2016 2017 2018 2019 13.2% 13.7% 13.1% 12.4% Retention Ratio (%) 50.0% 50.0% 50.0% 50.0% 50.0% Total Asset Turnover Ratio 1.90 1.85 1.70 1.75 1.65 Financial Leverage (Assets/Equity) 1.50 1.50 1.50 1.50 1.50 Actual Growth Rate in Sales (%) 6.2% 3.0% -2.1% 4.7% 3.5% a) Calculate the company's sustainable growth rate for the years 2015 - 2019. b) Compare the company's sustainable growth rate with its actual growth rate in sales. What growth management challenge did the company face over this period? + c) What could the company do to cope with this challenge?