Final answer:
To find the cost of one sandwich, divide the total cost by the number of sandwiches. In this case, each sandwich costs $6.79.
Step-by-step explanation:
To find the cost of one sandwich, we need to divide the total cost by the number of sandwiches. In this case, Sophia spent $27.16 on four sandwiches. Therefore, to find the cost of one sandwich, we divide $27.16 by 4:
Cost of one sandwich = $27.16 / 4 = $6.79
So, each sandwich costs $6.79.