A basketball fieldhouse seats 15,000. Courtside seats cost $10, endzone seats cost $7, and balcony seats cost $4. The total revenue for a sellout is $84,000. If half the courtside seats, half the balcony seats, and all the endzone seats are sold; then the total revenue is $49,000. How many of each type of seat are there? A. 3000 courtside, 4000 endzone, 8000 balcony OB. 3000 courtside, 2000 endzone, 10,000 balcomy C. 4000 courtside, 3000 endzone, 8000 balcony O D. 3200 courtside, 1800 endzone, 10,000 balcony