The first hour you study on Thursday night for your Friday morning Economics 101 final exam will

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The first hour you study on Thursday night for your Friday morning Economics 101 final exam will improve your grade on the final exam from a score of 50 percent to a score of 70 percent. The next hour you study improves your exam grade to a score of 85 percent. The third hour of studying moves your grade up to a score of 90 percent. This illustrates which of the following? 

a. Constant marginal costs 

b. Decreasing marginal costs

c. Increasing marginal benefits 

d. Decreasing marginal benefits 

e. Constant marginal benefits

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