The Holmes Division recorded operating data as follows for the past year:

Sales	$200,000
Operating Income	$25,000
Average Operating Assets	$100,000
Shareholders' Equity	$80,000
Residual Income	$13,000

1.For the past year, what was the return on investment?

2.For the past year, what was the margin?

3.For the past year, what was the turnover?

4.For the past year, what was the minimum required rate of return?