Computing and Interpreting Return on Assets and Its Components McDonald's Corporation (MCD) reported the following balance sheet and income statement data for 2016 through 2018.

Total Assets Net Income Sales

2018 $ 32,811.2 5,924.3 21,025.2

2017 33,803.7 5,192.3 22,820.4

2016 31,023.9 ----- ------

Required

a. What is McDonald's return on assets for 2018 and 2017?

b. Determine the profit margin for 2018 and 2017.

c. Calculate the asset turnover for 2018 and 2017.

d. What factor is mainly responsible for the change in McDonald's ROA over this period? Is it profit margin or asset turnover or both?