7.75% of $9,000 =
69,750.00
6,975.00
69.75
697.50

Amount given in the question = $9000
Percentage that needs to be determined = 7.75%
Then
7.75% of $9000 = (7.75/100) * 9000
                          = 7.75 * 90 dollars
                          = 697.5 dollars
So 7.75% 0f $9000 is $697.50. I hope the procedure is clear enough for you to understand.So the correct option among all the options given in the question is the last or the fourth option. You can always use this method for solving similar problems in future without requiring any help from outside.