Depends on whether it a brand new car or used. Dealers make more profit on used cars than new.
The amount of a dealer's new-car profit can be very different on different car makes/models and profit can be created in different ways -- selling maintenance or extended warranties for example. After paying rent, insurance, commissions, and other costs, the bottom line profit on brand new cars is very low.
A dealer's profit on used cars depends on what he paid for each car, which can vary widely, compared to selling prices in his area. Of course, he can set *asking* prices to any amount he wants, and his profit can depend on the negotiating skills of customers. However, don't expect a dealer to sell a car at a loss or for less than his minimum profit objective, which you have no way of knowing.