Draw the decision tree on paper or in excel

On Monday, a certain stock closed at $10 per share. On Tuesday, you expect the stock to close at $9, $10, or $11 per share, with respective probabilities 0.3,0.3, and 0.4 . On Wednesday, you expect the stock to close 10 percent lower, unchanged, or 10 percent higher than Tuesday's close. Suppose that the current time is at the beginning of Tuesday, so you do not know Tuesday's close yet. Now, you are directed to buy 100 shares of the stock before Thursday. All purchases are made at the end of the day, at the known closing price for that day, so you only options are to buy at the end of Tuesday or at the end of Wednesday. You wish to determine the optimal strategy for whether to buy on Tuesday or defer the purchase until Wednesday to minimize the expected purchase price of the 100 shares. Develop a decision tree using TreePlan to minimize the expected purchase price. Based on your decision tree, answer the following questions: (1) Describe the optimal strategy (whether to buy or wait at the end of Tuesday, given Tuesday's closing price). (2) Report the minimal expected purchase price of the 100 shares as of Monday