15.1 In Gas Pump, South Dakota, every Buick owner's demand for gaso- line is 20 5p for p less than or equal to 4 and 0 for p > 4. Every Dodge owner's demand is 15 3;) for p less than or equal to 5 and 0 for p > 5. Suppose that Gas Pump, S.D., has 100 Buick owners and 50 Dodge own- ers. If the price of gasoline is 4, what is the total amount of gasoline demanded in Gas Pump? (a) 300 (b) 75 (a) 225 (d) 150 (6) None of the other Options are correct. 15.2 In Problem 15.5, the demand function for drangles is given by D(p) = (p + 1)_2. If the price of drangles is 10, then the price elasticity of demand is (a) 7.27. (b) 3.64. (c) 5.45. (a) 0.91. (e) 1.82