Last week after running for four hours mary considered


Every week, Mary runs for four hours, and her grade on each psych test is 80 percent.

Last week, after running for four hours, Mary considered running for another hour. She decided to run for another hour and cut her study time by one hour.

But last week, her psych grade fell to 60 percent.

Did Mary make her decision on the margin?

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Macroeconomics: Last week after running for four hours mary considered
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