The members of the city cultural center have decided to put on a play once a night for a week. Their auditorium holds 500 people. By selling tickets, the members would like to raise $3,350 every night to cover all expenses. Let d represent the number of adult tickets sold at $8.50. Let s represent the number of student tickets sold at $5.50 each. If all 500 seats are filled for a performance, how many of each type of ticket must have been sold for the members to raise exactly $3,350? At one performance there were two times as many student tickets sold as adult tickets. If there were 300 tickets sold at that performance, how much below the goal of $3,350 did ticket sales fall?