Yup looks good to me!
Of course just here to help and not to do your homework!
We have 4 choices for each ball, and each choice is independent.
Think factorials
oh oops i did increase not decrease
SORRY
1 year = 12 months
1 month = 2.9%
2.9 * 12 = 34.8%
Here to help
:D
oops sry..
the answer is 5/9
+639 
