I left home with the exact money to I need to fly to Osaka, but changed my mind on the way and took the train instead. I bought a 1,000 yen box lunch on the bullet train. When I arrived in Osaka, I had 500 yen left in my wallet. If you compare only the fare, how much cheaper is the train than the plane? Explain why.
 Your answer should have exactly 4 paragraphs. Make sure that the last paragraph starts with the word "important" and that each paragraph is separated by two new lines.
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