everything is the same except the cost of capital is 12% , project F's and project G's cash flow is 9000 not 8000

Need help answering C , if you can show work would be helpful.

14-6 Project F has a cost of $3,000 and Project G has a cost of $4,000. These two projects are mutually independent and their possible net cash flows are given below. Assume that the cost of capital is 10 percent 272 PART 4: CAPITAL EXPENDITURE ANALYSIS Net Cash Flows Economic Condition Probability Project F Project G Boom 0.50 $8,000 $0 Recession 0.50 0 8,000 (a) Determine the net present value of Projects F and G. (b) Determine the standard deviation of Projects F and G. (c) Determine the portfolio net present value and standard deviation