Question 20 Not yet On January 1, a machine with a useful life of five years and a residual value of $30,000 was purchased for $90,000. What is the depreciation expense for year 2 under the double-declining- balance method of depreciation? answered Marked out of 1.00 a. b. Flag question C. d. Select one: O a. $36,000 b. $17,280 c. $21,600 d. $28,800 O