Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: the price of lunch for 15 people was $ 210.00 , including a 15 percent gratuity for service . what was the average price per person , excluding the gratuity ?
$ 12.72
$13.33.