First. The price is irrelevant. It doesn’t ask you cost.
So....
Each person will eat 2 servings of 3/8 pounds. That’s 3/4 of a pound per person.
15 people x 3/4 pounds each is 11 1/4 or 11.25 pounds of turkey.
If you need the cost. 11.25 pounds x $1.05 per pound is $11.8125 ($11.81)