An airline charges $100 for an economy class seat, $200 for a business class seat, and $400 for a first class seat. There are two times as many economy class seats as business class seats on an airplane. The revenue from selling all 100 seats on the airplane is $16,000. How many of each type of seat does the airplane have? The airplane has___ economy class seats, ___ business class seats, and__ first class seats.