$17.99-10%

To calculate the 10% discount, multiply the original price $17.99 by 10%:

$17.99 * 0.10 = $1.799

The discount amount is $1.799.

Now subtract the discount amount from the original price to find the final price:

$17.99 - $1.799 = $16.191

Therefore, the final price after the 10% discount is $16.191.