Green Energy Inc. is deciding between two investment projects with the following net cash flows. The company's required rate of return on investments is 14%. (PV of $1, FV of $1, PVA of $1, and FVA of $1).

Year	Project Solar	Project Wind
0	$(500,000)	$(450,000)
1	$140,000	$120,000
2	$180,000	$150,000
3	$220,000	$180,000
4	$260,000	$210,000

a. Determine the payback period for each project. Which project is preferred based on the payback period?

b. Determine the net present value for each project. Which project is preferred based on the net present value?