Homework Ch 01 Due Today at 1159 PM MST SolutionThe marginal

Solution

The marginal gain or additional gain from Kyoko\'s second hour of work , from 9:00 A.M to 10:00 A.M , is (175-100) = 75 problems.

The marginal gain from Kyoko\'s fourth hour of work, from 11:00 A.M to noon, is (250-225) = 25 probems.

Working on 62.5 problems raises a student exam score by about the same amount as reading the textbook for 1 hour. (as mentioned in the question).

In order to use her 4 hours of study time to get the best exam score possible, then she should spent that many hours on reading or working on problems that will improve her exam grade by the largest amount.

If she can do more than 62.5 problems in an hour, then working on problems will help to raise her grade more than reading would do. Because marginal gain from 1st hour= 100 problems and the marginal gain from 2nd hour = 75 problems . And after that marginal gain reduced to 50 problems i.e for 3rd hour. So, she will stop after 2nd hour to solving problems because she can get more exam score by reading as 50 problems is less than 62.5 problems.It implies that hse will spend first 2 hours on solving problems and remaining 2 hours spent on reading to get the maximum exam score possible.

Hence, 2 hours working on problems and 2 hours on reading.