GKD Construction purchased a truck $6$ years ago at a cost of $$71600.$ Because the old truck required an overhaul of $$4100$ last year, and repairs of $$2500$ are needed in the current year, the company is now planning to purchase a new truck to replace the old one. The old truck has a trade$-$in value of $$5400.$ The cost of the new truck is $$82400.$

What amount of these costs represent sunk costs?

$$83600$

$$71600$

$$81100$

$$75700$