/// <summary>
/// Calls the class method DatabaseInformation and counts the returned elements of the called method.
/// </summary>
/// <returns>The average cost of all cars.</returns>
public int GetAverageCostOfAllCars()
{
int countOfCostPerUnit = databaseInformation.getTheSumOfTheCostPerUnit();
int countTheNumberOfAllCars = GetTheNumberOfCars();
return(countTheNumberOfAllCars / countOfCostPerUnit);
}
