Suppose the market for petrol in an economy is monopolised and the market supply is given by Q = 2P and the market demand is given by Q = 12 - 2P, where P is the price in dollars, Q is the quantity. Examine this market structure and solve for the equilibrium price, the equilibrium quantity, the consumer surplus, the producer surplus and the deadweight loss in the petrol market. Explain your answers with a suitable petrol market diagram.