It is loosely based on prev.years (plural) sales history along with other calculations and gov. Guidelines.
Like 15 - 20 different cars.
14
potato
2700
There are many products that can be used as fuel for cars. These products are more natural and better for the environment than fuel. Yeast can be used to produce fuel for cars by breaking it down.
They probably rent them as needed.
as many as they can sell
around 10,200
In 2008 6,040,582 German cars were sold according to the Automotive Industry wikipedia page.
172,907 new cars were sold in July, 2014. The automotive industry in the UK estimates 2.45 million cars will be sold in 2014.
many produce green-house gasses and are bad for the environment
There are many companies which are responsible for the sale of cars in Australia for example Mazda or Seat. These are the same companies which also produce cars.