9. Commuters in a city travel by one of three ways: drive alone, car pool, or take the bus. Each month, of those who drive by themselves, 20% join a car pool, 30% switch to the bus, and rest continue driving alone; of those who car pool, 30% switch to driving alone, 20% switch to the bus, and rest stay in the car pool; and those who take the bus, 20% switch to driving alone, 30% join a car pool, and the rest continue taking the bus. After many months, how many of the three million commuters will be driving alone