Lex-Fuel, where gasoline is blended with ethanol, is becoming more and more popular. E85, a blend that consists of 85% ethanol and 15% gasoline, is 80% cleaner-burning than gasoline alone, and it reduces our dependency on foreign oil. However, flex-fueled cars cost $1000 more than a conventional gasoline-fueled car, because of the modifications that are required to use a different fuel. Additionally, E85 gets 10% less miles per gallon than a conventional automobile, because ethanol has a lower energy density than gasoline. In other words, if a 100% gas-fueled car averages 45 miles per gallon, an equivalent car that uses E85 would averaged about 40.5 miles per gallon. If either car would be driven 90,000 miles before being traded in, what is the upper bound for how much the E85 fuel can cost (per gallon) to make the flex-fueled car as economically attractive as a conventional gasoline-fueled car