a. On the basis of these data, is the price change for brand A successful? Explain why? (5 points) b. Calculate the loyalty rate for each brand. What brand has the highest loyalty rate Show your calculations. (5 points) c. Which of the brands B, C, D should be least worried about A's promotion? Explain why? (5 points) 2. (5 points) What is test marketing? Explain the pros and cons of test marketing a. On the basis of these data, is the price change for brand A successful? Explain why? (5 points) b. Calculate the loyalty rate for each brand. What brand has the highest loyalty rate Show your calculations. (5 points) c. Which of the brands B, C, D should be least worried about A's promotion? Explain why? (5 points) 2. (5 points) What is test marketing? Explain the pros and cons of test marketing