Q4 (4 points) Suppose demand and supply curves in the vitamin supplements market have the following functional forms: QD = 112-4P and Qs = 6P-18, where P is measured in dollars per bottle of vitamins. Part (a): Suppose vitamins are initially priced at $8. Identify whether there is excess supply or excess demand, and calculate the level of excess supply or excess demand that exists in the market. Part (b): Based on your answer to part (a), describe how the price must adjust. Part (c): Calculate the equilibrium price and the bottles of vitamin supplement sold