Your firm's last five daily net cash flows are shown below.

Day	Net Cash Flow
1	$50,000
2	$75,000
3	$15,000
4	$24,000
5	$11,000

The standard error of the last five daily net cash flows is $12,087.18. Assuming a confidence level of 90%, what is the confidence interval for the last five daily net cash flow?

	a.	($24,756.36, $54,629.04)
	b.	($12,401.25, $73,547.39)
	c.	($8,679.14, $49,071.58)
	d.	($9,231.98, $60,768.02)