Question: Jean has decided it is time to buy a new battery for her car. Her choices are:
Zappo Kicko
First cost $56 $90
Guarantee period, in months 12 24
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?