12. Suppose Ambika, a graduate student in economics, tutors undergraduates to supplement her income as a teaching assistant. Ambika might tutor nine students each week. Their reservation prices for tutoring are given in the following table.

Each tutoring session lasts an hour. If the opportunity cost of Ambika’s time is $20 per hour, and if she must charge each student the same price, how many students should she tutor each week?
What price should she charge? What will be her economic profit?

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student Reservation price $50 ABCDEFGH 46 42 38 34 30 26 22 1 - 18