Please provide the calculations/justifications for all questions

20 'MSC MC D 5 15 Tuba Music The graph above shows the market for Tuba Music, which imposes an external cost on the roommates and neighbors of those who consume it. Use this information to answer the following three questions. MSC = Marginal Social Cost MC = Marginal cost D = demand 4. What is the marginal external cost of Tuba Music? a. $15 b. $13 c. $10 d. $7 e. $5 5. What is the socially optimal quantity of Tuba Music? a. 3 5 C. 8 d. 15 6. What is the market equilibrium quantity of Tuba-Music? a. 3 b. 5 C . 8 d. 15