Attempts Keep the Highest 3 5 A decision at the margin Loren

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

Solution

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