Chuck paints seascapes and landscapes. In 2017 she placed nine of her most prized paintings with the Blackwright Studio Gallery. The paintings each carried a price of $10,000, and Chuck made a deal with the Gallery to pay them a 40% commission on all paintings sold. At the end of the year three paintings had been sold. How much revenue will Chuck recognize on the consignment sales?

a. $30,000

b. $18,000

c. $12,000

d. $0