Low-energy light bulbs typically cost $3.60, have a life of 9 years, and use about...

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Finance

Low-energy light bulbs typically cost $3.60, have a life of 9 years, and use about $2.00 in electricity a
year. Conventional light bulbs are less expensive, since they cost only $0.60, but they last only a year
and use about $7.00 in electricity. If the discount rate is 4%, which product is cheaper to use? (hint:
first determine the NPV of the costs associated with each type of light bulb, and then convert this NPV
into an equivalent annuity, or an equivalent annual cost).

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