STU Inc. is considering two investments. Project C requires an initial investment of $250,000, and Project D requires $300,000. The cash inflows are as follows:

Year	Project C	Project D
1	$100,000	$120,000
2	$110,000	$130,000
3	$120,000	$140,000
4	$130,000	$150,000

Requirements:

1. Calculate the NPV of each project at a discount rate of 10%.
2. Determine the IRR for each project.
3. Compute the payback period and the discounted payback period.
4. Find the profitability index.
5. Discuss the decision-making process for selecting the better project.