Consider the following financial data (in millions of dollars) for Costello Laboratories over

Consider the following financial data (in millions of dollars) for

Costello Laboratories over the period of 1992–1996:

Y ear	Sales	Net Income	T otal Assets	Common Equity
1995	$3,800	$500	$3,900	$1,800
1996	4,400	650	4,400	2,100
1997	5,000	750	4,800	2,500
1998	5,400	860	4,900	2,700
1999	6,200	1,000	5,600	2,800

a. Calculate Costello’s return on assets for each year. b. Calculate Costello’s return on equity for each year.

c. Using the Du Pont System, describe the changes in the return on assets from year to year.

d. Using the Du Pont System, describe the changes in the return on equity from year to year.