An electric switch manufacturing company has to choose one of
the three different assembly methods. Method A will have a first
cost of $40,000, an annual operating cost of $9000, and a service
life of 2 years. Method B will cost $80,000 to buy and will have an
annual operating cost of $6000 over its 4-year service life. Method
C will cost $130,000 initially with an annual operating cost of
$4000 over its 8-year life. Methods A and B will have no salvage
value, but method C will have some equipment worth an estimated
$12,000. Which method should be selected? Use present worth
analysis at an interest rate of 10% per year.
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