1) Three production machines are considered on a project, and the useful life for equipment (A) is 1 year, useful life for equipment (B) is 4 years, and the useful lif for equipment (C) is 5 years. Based on the least multiple common of lives, the planning horizon should be: A) 60 years. B) 30 years. C) 12 years. D) 20 years. 2) Suppose we have three alternatives, and the least common multiple of lives equal to 12 years and MARR=10%. If the annual worth for a life cycles is equal to $50,000 for alternative A. what will be the present worth over a least common multiple of lives. A) $340,684 B) $282,511 C) $309,718 D) More information is needed to calculate the present worth