college math

sam bought 1 of 250 tickets for $2 in a raffle with the prize of $400. Was $2 fair price?

Can someone show me the formula on how to get this answer. My text is super confusing.

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  1. expected value=pr(win)* prize
    = 1/250 * 400
    Is that expected value greater than the cost of the ticket?

  2. A box, with rectangular sides, base and top is to have a volume of 4 cubic feet. It has a square base. If the material for the base and top costs 10 dollars per square foot and that for the sides costs 20 dollars per square foot, what is the least cost it can be made for?

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  3. First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked.

    Second, your description of the problem is confusing and inadequate. Does "rectangular" apply to all "sides, base and top" or just "sides"? With the statement that follows it, I assume the latter.

    Without more information, it is impossible to determine how tall the box is and how small the base is. If the sides were square rather than rectangular, it could be resolved. Is that the case?

    Can you repost with more adequate information?

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