Shown here is a list of the top five industrial and farm equipment companies in the United States, along with their annual sales ($ millions). Construct a pie chart and a bar graph to represent these data, and label the slices with the appropriate percentages. Comment on the effectiveness of using a pie chart to display the revenue of these top industrial and farm equipment companies.

Firm Revenue ($ million)

Caterpillar .........30,251

Deere ..........19,986

Illinois Tool Works ......11,731

Eaton .......... 9,817

American Standard ..... 9,509