Answer:
_ A _ E _ I _ O _ U _
as you can see there are 6 _s
so the first consonant can go in any of the 6 places, the second go to any 7 places, the third consonants go to any 8 places, the forth consonant can go to any 9 places
hence the total number of arrangements is 6.7.8.9=9p4=3024