a. Carculate the payback period for each of the projects. Which project should be has the highest nreference if the decision is made according to the payback nite? Explain why choosing this project will hurt the company. b. Calculate the NPV of each of the project if interest rate is 5% compounded yearly. Which projects should be chosen based on the NPV rule? c. Calculate the profitability index for ench of the projects. d. If the company has difficulty of raising enough money in the stock market to take up new profitable projects, what type of constraint is the company facing