On January 1, 2021, a machine has a historical cost of $500,000 and accumulated depreciation of $470,000. The residual value of the machine is $25,000. The company uses the double-declining balance method of depreciation. I 2021 is the last year for depreciation, what is Depreciation Expense for the year ending December 31, 2021? $30,000 $5,000 $7,500 $25,000