HELP PLZ !!?

An auto dealer marks up the new and used cars that he sells. New cars are marked up 5% and used cars are marked up 3%.

A. A new car cost the dealer $15,000. How much money will the dealer receive when he sells the car?

B. The dealer paid $10,250 for a car and sold it for $10,557.50 was the car new or used how can you tell? ​