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:

Camper and equipment:

Cost, $$12,000$; usable for eight seasons; $10$ hunting trips per season $ $150$

Travel expense $($pickup truck$)$:

$100$ miles at $$0\mathrm{.}31$ per mile $($gas$,$ oil, and tires$$$$0\mathrm{.}21$ per mile; depreciation and insurance$$$$0\mathrm{.}10$ per mile$)31$

Shotgun shells $($two boxes per hunting trip$)20$

Boat:

Cost, $$2,320,$ usable for eight seasons; $10$ hunting trips per season $29$

Hunting license:

Cost, $$30$ for the season; $10$ hunting trips per season $3$

Money lost playing poker:

Loss, $$24($Bill plays poker every weekend whether he goes hunting or stays at home$)24$

Bottle of whiskey:

Cost, $$15$ per hunting trip $($used to ward off the cold$)15$

Total cost $ $272$

Cost per duck $($$$272-$: $8$ ducks$)$ $ $34$

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 $10$ 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 two ducks?