The year is 2022 and today is July 1 (by assumption). You plan to fly from Newark to Amsterdam on August 2 and return on August 25. Today you can buy a one-way ticket for $350 or a round-trip ticket for $660. You could also wait until August 1 to buy your tickets. On August 1, a one-way ticket in either direction will cost $370, and a round-trip ticket will cost $730. Between July 1 and August 1, there is a 30% chance that your best friend will be able to provide you with a free one-way ticket as a present. If you buy a round-trip ticket on July 1 for $660 and your friend provides a free ticket, then you can return the second half of your round-trip ticket to the airline, after paying a $50 penalty. In this case, your net travel cost will become $380. Develop a decision tree to determine how to minimize your expected travel cost. Find the optimal policy.

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two years ago, when picking flowers in the mountains back of yosemite valley, i found a book. it was blotted and storm-beaten; all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however; many of the inner pages were well preserved. and although all were more or less stained and torn, whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today; its granite pages have been torn and blurred by the same storms that wasted the castaway book.

two years ago, when picking flowers in the mountains back of yosemite valley; i found a book. it was blotted and storm-beaten, all of its outer pages were mealy and crumbly. the paper seemed to dissolve like the snow beneath which it had been buried, however, many of the inner pages were well preserved. and although all were more or less stained and torn; whole chapters were easily readable. this is the condition of the great open book of yosemite glaciers today, its granite pages have been torn and blurred by the same storms that wasted the castaway book.