17. NPV and Profitability Index. Robben Manufacturing has the following two possible projects. The required return is 12 percent. Year Project Y Project Z 0 1 2 3 4 -$43,400 19,800 17,500 20,700 14,600 -$78,000 32,000 30,100 29,500 27,300 a. What is the profitability index for each project? b. What is the NPV for each project? Which, if either, of the projects should the company accept? c. 17. NPV and Profitability Index. Robben Manufacturing has the following two possible projects. The required return is 12 percent. Year Project Y Project Z 0 1 2 3 4 -$43,400 19,800 17,500 20,700 14,600 -$78,000 32,000 30,100 29,500 27,300 a. What is the profitability index for each project? b. What is the NPV for each project? Which, if either, of the projects should the company accept? c