Supply curves

When a firm is able to engage in perfect price discrimination, its marginal revenue curve

A) lies below its demand curve. B) is the same as its demand curve. C) lies above its demand curve. D) is the same as its supply curve. E) is undefined because it does not exist.

Suppose Jack and Kate are at the town fair and are choosing which game to play. The first game has a bag with four marbles in it-1 red marble and 3 blue ones. The player draws one marble from the bag; if it is red, they win $20 and if it is blue, they win $1. The second game has a bag with 10 marbles in it-1 red, 4 blue, and 5 green. The player draws one marble from the bag; if it is red, they win $20; if it is blue, they win $5; and if it is green, they win $1. Both games cost $5 to play. What is the probability of drawing a blue marble in the first game?

A. 25 percent B. 20 percent C. 50 percent D. 75 percent