Bill has just returned from a duck hunting trip. He brought home 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:quad$15$$quad$251$

Required:

Assuming the duck hunting trip Bill has 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?