QUESTION 18 The price elasticity of toy cars that you sell is 3.00; you currently charge a price of $9.00 and marginal cost of toy cars is $8.00. Do you need to increase the price or decrease the price? QUESTION 19 The price elasticity of toy cars that you sell is -3.00; you currently charge a price of $9.00 and marginal cost of toy cars is $8.00. Using the above information, you should be able to find the price that will maximize your profits. The graph of f(x) is shown below. Where is f(x) > 0? Write your answer in interval notation. Preview no answer given 10 9 8- -7- 6- 15 -7 -6 -2- 4- -7- -9 --10 2.