Answer:
744
Step-by-step explanation:
The alphabet has 26 letters. Since each character of the password can be a capital letter or one of the four character of the set {*, $, &, #, %}, then each space in the password has 26+5=31 options to select a character.
a) If the password has length 7, then there are 31*7=217 different passwords.
b) If the password has length 8, then there are 31*8=248 different passwords and,
c) if the password has length 9, then there are 31*9=279 different passwords.
Then the total of different passwords is 217+248+279=744.
