Carter is a songwriter who collects royalties on his songs whenever they are played in a commercial or a movie. carter will earn $50 every time one of his songs is played in a commercial and he will earn $130 every time one of his songs is played in a movie. carter earned a total of $1000 in royalties on 12 commercials and movies. determine the number of commercials and the number of movies on which carter's songs were played.