Question 3 [40 points] Two storage structures, given code names Y and Z, are being considered for a military base located in Sontaga. The military uses a 5 percent/year expected rate of return and a 24-year life for decisions of this type. The relevant characteristics for each structure are shown below. a. Calculate the discounted payback period of both structures. b. Based on IRR analysis, which structure is the best alternative?