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2. Low-energy lightbulbs typically cost $3.50, have a life of 9 years, and use about $1.60...

2. Low-energy lightbulbs typically cost $3.50, have a life of 9 years, and use about $1.60 of electricity a year. Conventional lightbulbs are cheaper to buy, for they cost only $.50. On the other hand, they last only about a year and use about $6.60 of energy. If the discount rate is 5%, which product is cheaper to use?

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