Big Drive Auto is a multistate dealer of different manufacturer' trucks and cars. The company deals in vehicles, which they service and provide spare parts for repairs. Motor vehicle tires, oil, and coolant, are a significant part the business. With the current rates of economic inflation, management is constantly scanning the environment for ideas that will benefit the firm. Big drive auto analyzes volume sales data over the last 9 years as units sold in some cases and constant dollar sales in other cases.