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Research shows that after-school jobs are highly correlated with decreases in grade point averages. Those who...

Research shows that after-school jobs are highly correlated with decreases in grade point averages. Those who work 1 to 10 hours get a 3.0 GPA and those who work 21 hours or more have a 2.7 GPA. Higher GPA are, however, highly correlated with higher lifetime earnings. Assume that a person earns $8,000 per year for working part-time in college, and that the return to 0.1 increase in GPA gives one a 10 percent increase in one's lifetime earnings with a present value of $80,000. a) What would be the argument for working rather than studying harder? b) Is this assumption that there is a trade-off between working and grades reasonable? Can I make a graph to get these answer? How?

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