Information taken from the annual reports of Mobilex, a petroleum company, for three recent years appears below (amounts in millions of US$):

a. Compute the rate of return on equity for each year.
b. Disaggregate the rate of return on equity into profit margin, total assets turnover, and financial leverage ratio components.
c. How has the profitability of Mobilex changed over the threeyears?

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2013 2012 2011 Revenues. Net Income . $404,552 $377,635 $370,680 36,130 201,796 117,803 112,515 106,471 . 40,610 39,500 213,675 . . . . _.... Average Shareholders' Equity ..