4. In 1998, Americans smoked 20 billion packs of cigarettes, and the retail price was about $5.00 per pack. Price elasticity of demand is estimated to be -0.6 and price elasticity of supply is estimated to be +0.75. a. Reconstruct linear demand and supply equations from the data above and illustrate them on a graph. (4 pts) b. Calculate and illustrate the impact of a 60 cents tax on cigarettes. (New eq. P, Q, ACS, APS, AG, DWL) (6 pts)