Question

Boris is considering buying a new lawnmower. He has a choice between X mower and a...


Boris is considering buying a new lawnmower. He has a choice between X mower and a Y mower. The salvage value of each mower at the end of its service life is zero.

X

Y

First Cost

$350

$120

Life

10 years

4 years

Annual Gas

$60

$40

Annual Maintenance

$30

$60

Find which alternative is preferable using the IRR method and a MARR of 5 percent. Answer the following question by using present worth computations to find the IRRs. Use the least common multiple of service lives. Which of the two alternatives should be chosen? Use the ERR method if necessary.

(It is important to use least common multiple of service lives in this question.)

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