9.3 Use the following information to answer the questions that follow?

A. Calculate the operating income percentage for each of the courses. Comment on how your analysis has changed for each course.
B. Perform a vertical analysis for each course. Based on your analysis, what accounts would you want to investigate further? How might management utilize this information?
C. Which method of analysis (using a dollar value or percentage) is most relevant and/or useful? Explain.