Replying to Math help

I wouldt usually do this but i have a test tomorrow and need help this is grade 12 data management

so the question is how many permutations are there of the letters in the word baseball?

so the anwser to that is

8!
-----
2! 2! 2!

= 40320
________
8

which equals 4200 permutations of the word baseball

now that took all of my cunning and i was pretty hapy wen i got it then i look down to part B and it says

How many of these permutations start with the letter A and my mind imploded

please help me :D