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Car X gets 25 percent more miles per gallon of gasoline than [#permalink]
05 Sep 2005, 14:55
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Car X gets 25 percent more miles per gallon of gasoline than Car Y does. However, Car X requires premium gasoline that costs 10 percent more than regular gasoline used by Car Y. If the two cars are driven equal distances, what percent less than the money spent on gasoline for Car Y is the money spent on gasoline for Car X?
Plugging easy numbers (doesn't matter if they're realistic or not):
Car Y gets 100 miles per gallon. Car X gets 25% more or 125 miles per gallon. A gallon costs $1.00. So if they both drive 100 miles, car Y spends $1.00 and car X spends (100/125) or 0.8 x ($1.00x1.1) = 0.8 x $1.10 = $0.88.
$0.88 is 12% less than $1.00. So the answer would be D) 12%.