The correct answer is:
$19.99.
Explanation:
33 1/3% is equal to taking 1/3 of a number. To take 1/3 of a number, we multiply by 1/3:
29.99(1/3) = 29.99/3 = 9.9966666667 ≈ $10
This means the price is marked down by $10. This makes the new price 29.99-10 = 19.99