There are a few things that can affect the amount of markup on a car. For example, if a car is in high demand, the dealer may be able to charge a higher markup. Similarly, if a dealer is located in a competitive market, they may be forced to lower their markup in order to stay competitive.
The best way to get an accurate estimate of the markup on a car is to talk to a dealer. However, it is important to remember that dealerships are not required to disclose their markup, so you may have to do some negotiating in order to get the best price possible.