When a oligopolist individually chooses its level of production to maximize its profits it charges a price that is ?

A. more than the price charged by either monopoly or a competitive market
B. less than the price charged by either monopoly or a competitive market
C. more than the price charged by a monopoly and less then the price charged by a competitive market
D. less than the price charged by a monopoly and more than the price charged by a competitive market

Suppose that ABC publishing sells an economics textbook and accompanying study guide. Raheel is willing to pay Rs75 for the text and Rs15 for the study guide. Mariam is willing to spend Rs60 for the text and Rs25 for the study guide. Suppose both the book and study guide have a zero marginal cost of study production. If ABC publishing engages in tying the two products its best strategy is to charge a combined price of ?

A. Rs 60
B. Rs 90
C. Rs 85
D. Rs 75