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15. You want to travel from Chicago to Denver either by bus or by airplane. The bus ticket costs $60 and the trip takes 12 hours. The plane ticket costs $160 and the plane trip takes 2 hours. What value would you have to place on your time in order to make the plane the cheapest way to travel? a. at least $10.01 per hour. b. at least $ 8.01 per ... ................
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