Charleston, LLC purchased a machine exactly $5$ years ago for $$1,800,000.$ The machine is being depreciated on a straight$-$line basis to a salvage value of zero over its estimated useful life of $10$ years. What is the current book value of this machine?

$$800,000$

$$80,000$

$$900,000$

$$60,000$

$$50,000$

None of the other answers in this list are correct.

$$1,000,000$

$$700,000$

$$70,000$