-4. A special-purpose machine is to be depreciated as a linear function of use Iw Cos $25,000 and is expected to produce 100,000 units and then be sold for $5,000. Uptofk end of the third year it had produced 60,000 units, and during the fourth year it produnt 10,000 units. What are the depreciation charge for the fourth year and the BV at theed of the fourth year