Cost of basic car = $8250
Optional cost = $324
Total cost of basic car and optional items for John= (8250 + 324) dollars
 = 8574 dollars
Then 
Percentage of sales tax = 6%
Amount of sales tax = 8574 * (6/100) dollars
 = 514.44 dollars
License and registration fee combined = $50
Then total cost of John in regards to buying the car = 8574 + 514.44 + 50
 = 9138.44 dollars
$9,138.44 is the correct option in regards to the question given.