To determine the total cost of Troy's order, we need to know the price per pound for ham, cheese, and turkey. However, since the prices are not provided in your question, I can't calculate the total cost.
If you have the prices for ham, cheese, and turkey, please provide them, and I can help you calculate the total cost based on the quantities you mentioned: 8 pounds of ham, 15 pounds of cheese, and 12 pounds of turkey.