12-7) Projects E and F have an identical cash investment of $30,000. Project E will have a net cash flow of $12,000 a year for the next four years. Project F will have net cash flows of $13,000,$14,000, and $15,000 for the next three years. The cost of capital is 15 percent. a) Determine the net present value for Projects E and F b) Determine the profitability index for projects E and F c) Determine the IRR for each project