3. The owner of Grand Central Bookstore is looking into the sales of its Health & Fitness magazine section. She finds that her equilibrium is at 800 magazines per month sold at an average price of $4.75 per magazine. When the price of these Health & Fitness magazines rose to $5.00 each, the quantity sold fell to 725 magazines per month, while the quantity supplied to her increased to 900 a month. From the scenario described, answer the questions below. (40 points)