5.8 A 2 kW photovoltaic (PV) system with capacity factor 0.20 costs $8000 after various incentives have been accounted for. It is to be paid for with a 5%, 20-year loan. Since the household has a net income of $130,000 per year, their marginal federal tax bracket is 30.5%. a. Do a calculation by hand to find the cost of PV electricity in the first year. b. Set up a spreadsheet to show the annual cash flow and annual /kWh for this system. What is the cost of PV electricity in the 20th year