Since irina has dropped off on her math question of the week, I’ll offer a much easier one:

My mother is looking for a car. There are two versions of the car she’s interested in: the conventional gas powered model and the hybrid model. The gas powered model gets 26 mpg in-city and 34 mpg on the highway. The hybrid gets 42 mpg in-city and 36mpg on the freeway. The hybrid costs $6000 more than the conventional gas powered model. If my mom buys the hybrid, how many miles will she have to drive in order to recoup her $6000 if she drives 70% of the time in-city, 30% on the freeway and the price of gasoline stays constant at $3 per gallon?

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