P9) There are three alternatives for a public transportation maintenance department: Equipment models X, Y, and Z. Investment costs, annual costs, and useful lifetimes are given below. Your organization plans to operate the maintenance department for a long time. Similar versions of each equipment will be available in the future, with similar costs and characteristics. Which is the preferred alternative, based on lower costs? Be sure you indicate which criterion you are using for making decisions. Costs are positive, for convenience; we want to minimize costs. MARR = 15% Y Model Investment cost Annual cost Salvage value Useful lifetime, Years 16,000 600 600 19,000 1,900 4,000 30,000 2,100 3,500 12 8