The following table shows the number of customer complaints against a U.S. car rental company during the given year: 
Use interpolation to determine the number of complains in 2009.
Definitions:
Unit Product Cost
The total cost to produce one unit of a product, including direct materials, direct labor, and allocated overheads.
Net Operating Income
An indicator of a company's profitability calculated by subtracting operating expenses from operating revenues, excluding taxes and interest.
Common Fixed Expenses
Overhead costs that do not fluctuate with the level of production or sales, such as rent, salaries of administrative staff, and insurance.
Net Operating Income
The total profit of a company after operating expenses are deducted from operating revenues, but before deducting taxes and interest.
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