Jean has decided it is time to purchase a new battery for her car. Her choices are:

Jean believes the batteries can be expected to last only for the guarantee period. She does not want to invest extra money in a battery unless she can expect a 50% rate of return. If she plans to keep her present car another 2 years, which battery should she buy?

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Zappo Kicko S56 90 First cost Guarantee period, in months 2 24