1: (4 marks) (Textbook Problem) Sam is considering buying a new lawnmower. He has a choice between a Lawn Guy mower and a Bargain Joe's Clip Job mower. Sam has a MARR of 5%. The salvage value of each mower at the end of its service life is zero. First Cost Life Lawn Guy $350 10 years $60 $30 Clip Job $120 5 years $40 $40 Annual Gas Annual Maintenance (a) Using the information above, determine which alternative is preferable. Use the Present Worth comparison based on the least common multiple of the service lives. (b) Instead of using the present worth comparison in part (a), use the Annual Worth comparison method to justify your selection (c) For a 5-year study period, what salvage value for the Lawn Guy mower would result in its being the preferred choice? What salvage value for the Lawn Guy would result in the Clip Job being the preferred choice