A manufacturer of heavy-tow carbon fibers(used for sporting goods, thermoplastic compounds, windmill blades,ect.) reported the net cash flows below. (a) Determine the number of possible rate of return values, and (b) find all rate of return values betwwen -50% and 120%

Year	Net Cash Flow, $
0	-17,000
1	20,000
2	-5,000
3	8,000