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Sarah is an ECON 321 student taking an exam. The exam has 5 questions worth 10 points each and 5 questions worth 20 points each.

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Sarah is an ECON 321 student taking an exam. The exam has 5 questions worth 10 points each and 5 questions worth 20 points each. She has 100 minutes to complete the exam. Assume Sarah wants to maximize her expected score. Explain how using an economic model she will optimally allocate her time among the 10 questions

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