An investment project requires an initial investment of $200,000. The project generates the following net cash flows over six years:

Year	Net Cash Flows per Year	Cumulative Net Cash Flows
Initial Investment	$(200,000)	$(200,000)
1	30,000	$(170,000)
2	40,000	$(130,000)
3	50,000	$(80,000)
4	60,000	$(20,000)
5	70,000	$50,000
6	80,000	$130,000

Requirements:

1. Compute the payback period for the investment.
2. Calculate the net present value (NPV) of the investment assuming a discount rate of 8%.
3. Determine the internal rate of return (IRR) of the project.
4. Assess the profitability index (PI) of the investment.