Bill just returned from a duck hunting trip with eight ducks. Bill's friend, John, disapproves of duck hunting, and to discourage Bill from further hunting, John presented him with the following cost estimate per duck:Required:

Assuming the duck hunting trip Bill just completed is typical, what costs are relevant to a decision as to whether Bill should go duck hunting again this season?

Suppose Bill gets lucky on his next hunting trip and shoots $14$ ducks using the same amount of shotgun shells he used on his previous hunting trip to bag $8$ ducks. How much would it have cost him to shoot the last six ducks?