Attempts Keep the Highest: 3 5. A decision at the margin Lorenzo is a hard-worki

Question

Attempts Keep the Highest: 3 5. A decision at the margin Lorenzo is a hard-working college freshman. One Thursday, he decides to work nonstop until he has answered 200 practice problems for his chemistry 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 9:00 AM 10:00 AM 11:00 AM 140 180 Noon Use the table to answer the following questions. The marginal gain from Lorenzo's third hour of work, from 10:00 AM to 11:00 AM, is Later, the teaching assistant in Lorenzo's chemistry course gives him some advice. "Based on past experience," the teaching assistant says, "working on 70 27

Explanation / Answer

The marginal gain from Loremzo's first hour of work from 8-9A.M. Is 80problems.

The marginal gain from 3rd hour of work from 10-11A.M. Is 180-140=40 problems.

Since reading textbook=70problems. Thus first hours of solving problem solves 80problems>reading 1 hour textbook

Second hour solves 60prob<reading 1 hour textbook

Thus 1hour should be used for problem solving and 3hours of reading textbooks.

Ans is B

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