I need only the answer to 6-10. 6-7 already completed

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. det 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 Cash Flows 2 -$50,000 3 $70,000 4 $60,000 5 $50,000 $30,000 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