An investment requires $160,000 upfront and yields the following net cash flows:

Year	Net Cash Flows
1	$25,000
2	$35,000
3	$45,000
4	$55,000
5	$65,000
6	$75,000

Requirements:

1. Calculate the cumulative net cash flows.
2. Determine the payback period.
3. Compute the NPV at a 8% discount rate.
4. Calculate the IRR.
5. Assess the PI.