Blu-Rays can be produced at a constant marginal cost of $5 per disk, and Superhero Studios is releasing the Blu-Rays for its last two major films. The Blu-Ray for Obscure-Man is priced at $20 per disk, and the Blu-Ray for Team-Up Flick 17: The Final Chapter, Part 1 is priced at $30 per disk. What are the price elasticities of demand for these two movies