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Ethanol blended with gasoline can be used to power a "flex-fueled" car

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Ethanol blended with gasoline can be used to power a "flex-fueled" car. One particular blend that is gaining in popularity is E85, which is 85% ethanol and 15% gasoline. E85 is 80% cleaner burning than gasoline alone, and it reduces our dependency on foreign oil. But a flex-fueled car costs $900 more than a conventional gasoline-fueled car. Additionally, E85 fuel gets 10% less miles per gallon than a conventional automobile. Consider a 100% gasoline-fueled car that averages 25 miles per gallon. The E85-fueled car will average about 23 miles per gallon. If either car will be driven 58.000 miles before being traded in, how much will the E85 fuel have to cost (per gallon) to make the flex-fueled car as economically attractive as a conventional gasoline-fueled car? Gasoline costs $2.78 per gallon. Work this problem without considering the time value of money. The E85 fuel will have to cost $|7.9| per gallon. (Round to the nearest cent.)