# THTRFLM 3L03 Study Guide - Final Guide: Wend Kuuni, Todd Gitlin, Class Discrimination

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**3. A decision at the margin**

Van is a hard-working college senior. On Thursday, he decides to work nonstop until he has answered 200 practice problems for his economics course. He starts work at 8:00 AM and uses a table to keep track of his progress throughout the day. He notices that as he gets tired, it takes him longer to solve each problem.

Time | Total Problems Answered |
---|---|

8:00 AM | 0 |

9:00 AM | 80 |

10:00 AM | 140 |

11:00 AM | 180 |

Noon | 200 |

Use the table to answer the following questions.

The marginal, or additional, gain from Van's first hour of work, from 8:00 AM to 9:00 AM, is:

The marginal gain from Van's third hour of work, from 10:00 AM to 11:00 AM, is:

Later, the teaching assistant in Van's economics course gives him some advice. Based on past experience, the teaching assistant says, working on 30 problems raises a student's exam score by about the same amount as reading the textbook for 1 hour. For simplicity, assume students always cover the same number of pages during each hour they spend reading.

Given this information, in order to use his 4 hours of study time to get the best exam score possible, how many hours should he have spent working on problems, and how many should he have spent reading?

1 hour working on problems, 3 hours reading

2 hours working on problems, 2 hours reading

3 hours working on problems, 1 hour reading

4 hours working on problems, 0 hours reading

**5. A decision at the margin**

Larry is a hard-working college freshman. On Saturday, he decides to work nonstop until he has answered 200 practice problems for his economics course. He starts work at 8:00 AM and uses a table to keep track of his progress throughout the day. He notices that as he gets tired, it takes him longer to solve each problem.

Time | Total Problems Answered |
---|---|

8:00 AM | 0 |

9:00 AM | 80 |

10:00 AM | 140 |

11:00 AM | 180 |

Noon | 200 |

Use the table to answer the following questions.

The marginal, or additional, gain from Larry's second hour of work, from 9:00 AM to 10:00 AM, problems.

The marginal gain from Larry's fourth hour of work, from 11:00 AM to noon, problems.

Later, the teaching assistant in Larry's economics course gives him some advice. Based on experience,Β the teaching assistant says, working on 70 problems raises a student's exam score by about the same amount as reading the textbook for 1 hour. For simplicity, assume students always cover the same number of pages during each hour they spend reading.

Given this information, to use his 4 hours of study time to get the best exam score possible, how many hours should he have spent working on problems and how many should he have spent reading?

0 hours working on problems, 4 hours reading

1 hour working on problems, 3 hours reading

2 hours working on problems, 2 hours reading

3 hours working on problems, 1-hour reading