6-7. the shop foreman at Santa Barbara Rig Service proposed a portable service unit requiring an initial outlay of $100,000 and providing the following year-end cash flows.

Year	1	2	3	4	5
Cash Flows	$30,000	-$50,000	$70,000	$60,000	$50,000

At a 10 percent required return, find the net present value. Is the investment desirable? Explain why this is desirable or undesirable assuming your audience is not trained in finance

6-9. Find the internal rate of return and modified internal rate of return for the above project in 6-7. Interpret these measures for a manager who is not trained in finance.

6-10. find the payback period and present value payback period for the investment in 6-7. Interpret these measures for a manager who is not trained in finance.