3.9 A copyright gave Universal Studios the legal monopoly to produce and sell the Mama Mia! DVD.

The DVD sold for $20 in the United States and

$36 (£22) in the United Kingdom. I estimate that the inverse demand functions for the United States and the United Kingdom were pA = 39 - 3QA and pB = 71 - 7QB, respectively. The marginal cost in both countries was m = 1. Solve for Universal’s optimal quantities and prices. (Hint: See Solved Problem 12.2.) A