Calculating Payback Perlod and NPV Tri Star, Inc., has the following mutually exclusive projects. YEAR PROJECT AT PROJECT B -$15,300 w No 8,700 -$10,700 5,300 4,300 4,800 7,400 3,100 a. Suppose the company's payback period cutoff is two years. Which of these two projects should be chosen? b. Suppose the company uses the NPV rule to rank these two projects. Which project should be chosen if the appropriate discount rate is 15 percent