PLEASE HELP! I DID THE MATH ON MY OWN AND GOT 15.81 BUT I DONT THINK THAT'S CORRECT. ANY HELP WOULD BE AMAZING <3

The ingredients to make 4 dozen blueberry muffins cost Harriett $13.35. One dozen blueberry muffins purchased at the bakery cost $7.29. How much does Harriett save by baking her own blueberry muffins?

$11.42

$12.08

$13.55

$14.99

None of these choices are correct.