The table shows the investment projected net cash inflows of the two projects over the coming 5 years.

Year	Project A	Project B
1	$200000	$120000
2	$200000	$130000
3	$200000	$150000
4	$200000	$200000
5	$200000	$240000

Initial investment of $500000 and discount rate at 18% per year under each project.

Discount factors for Year 1 to Year 5 as follows:

Year 1	0.8475
Year 2	0.7182
Year 3	0.6086
Year 4	0.5158
Year 5	0.4370

1. Find the payback period in years for each project. (please show step clearly)
2. Finish an evaluation for project A and project B using net present value at the above discount rate for year 1 to year 5.
3. Which one of projects is the best investment for the business? Explain your reason clearly.