Amazon.com has become one of the success stories of the Internet age. Its growth can be seen by examining its increasing sales volume (in $billions) and the net income/loss during Amazon's operations. A file entitled Amazon contains these data for its first 13 years.

a. Construct one bar graph illustrating the relationship between sales and income for each separate year of Amazon's existence.

b. Describe the type of relationship that exists between the years in business and Amazon's sales volume.

c. Amazon's sales rose sharply. However, its net income yielded losses, which increased during the first few years. In which year did this situation reverse itself and show improvement in the net income balance sheet?