What is calculated based on the number of rental cars and the number of tires per car?

The correct answer focuses on the relationship between the number of rental cars and the number of tires each car has. This calculation directly pertains to the tire requirement for the rental cars. In practical terms, for every rental car, a specified number of tires are needed – usually four for standard vehicles. Therefore, by multiplying the total number of rental cars by the number of tires each one requires, one can determine the total tire requirement for the fleet. This metric is essential for managing inventory, ensuring that there are enough tires available for maintenance needs, and planning for replacements or upgrades within the fleet.

Other options do not align with the relationship specified in the question. The fuel requirement would concern the cars' operational efficiency rather than their inventory of tires. Cost analyses for rental cars would involve various financial factors unrelated to tire counts. Lastly, performance metrics could include a wide range of data related to operational effectiveness but wouldn't specifically focus solely on tire numbers. Thus, the focus on tire quantities makes the tire requirement the appropriate calculation in this context.