A family is planning a three-week vacation for which they will drive across the country. They have a van that gets 18 miles per gallon, and they have a sedan that gets 24 miles per gallon. (Assume that the family will drive 2,100 miles and that gas costs $2.40 a gallon.) (a) How much more (in dollars) will they pay for gasoline if they take the van? $ (b) What if the price of gas rose by 40¢ between the planning of the trip and the actual trip? How much more (in dollars) would the gas cost for the trip? (Round your answers to the nearest cent.) for the van $ for the sedan $

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