Answer
a. Refer the image
b. Maria's opportunity cost of reading 100 pages of sociology is 40 pages of economics
Work Step by Step
Given that Maria's study time is 5 hours and she can study 20 pages of economics or 50 pages of sociology in an hour, for every hour of studying sociology, she gives up an hour of economics study. In the case, as given in (b), if she studies 100 pages of Sociology, she has spent 2 hours studying the same. Therefore her opportunity cost in this case is 40 pages of studying economics (effectively 2 hrs of her study time).
