12.10 Tabulate the annual cash flows of a solar energy system that has an initial cost of $7,000 for a 12-year analysis, where the following economic parameters apply:
Down payment = 20%
Interest rate = 9%.
First-year fuel saving = $1,250.
Market discount rate= 8%.
Fuel inflation rate = 8%.
Maintenance and parasitic cost = 0.5% increasing at 1% per year.
Resale value = 25%
Also estimate the life cycle savings and the return on investment .
12.11 Repeat Exercise 12.10 using the PI, Pr method.