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The TT Racing and Performance Motor Corporation wishes to evaluate two alternative machines for NASCAR motor tune-ups. The MARR adopted by TT Racing is 14.3 %. The two guesses for the RORs are : 14 % and 15% Machine S -80,000 28000 Machine R Initial cost, S -145000 Annual operating and 16000 maintenance cost, S per year Annual revenue,S per year 51000 61,000 Salvage value, $ ife, years 35,000 20,000 10