Alex is considering buying a new lawnmower. He has a choice between a Kobalt mower and a Craftsman mower. Alex has a MARR of 8%. The salvage value of each mower at the end of its service life is zero.

Calculate the Present Worth for both models based on the least common multiple (LCM) of the service lives. (Note: For this problem, LCM=70 years)

		PW(Kobalt for 70 years) = 3,637.466
		PW(Kobalt for 70 years) = 3,376.314
		PW(Kobalt for 70 years) = 3,061.513
		PW(Kobalt for 70 years) = 2,323.245
		PW(Kobalt for 70 years) = 2,078.771
		PW(Craftsman for 70 years) = 2,923.977
		PW(Craftsman for 70 years) = 2,453.582
		PW(Craftsman for 70 years) = 2,109.438
		PW(Craftsman for 70 years) = 1,850.216
		PW(Craftsman for 70 years) = 1,650.203

Kobalt $450 10 years First Cost Life Annual Gas Annual Maintenance Craftsman $300 7 years $50 $25 $70 $30