Demand and supply in a market are described by the equations Qd=66-3P Qs = -4+2P Solve algebraically to find equilibrium P and Q (ii) Graph the demand curve and supply curve. (ii) How would a per unit sales tax t affect this equilibrium and comment on how the tax is shared between producers and consumers. (iv) What is the equilibrium P and Q if the per unit tax is t-5 () Illustrate the pre-tax equilibrium and the post-tax equilibrium on a graph