"Consider two cars manufactured by Chevrolet in 2007. During 2007, Chevrolet sells one of the two cars to Sean for $24,000. Later in the same year, Sean sells the car to Kati for $19,000. The second automobile, with a market value of $30,000, is unsold at the end of 2007 and it remains in Chevrolet’s inventory. The transactions just described contribute how much to GDP for 2007?"