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?

a.

b.

C.

d.

Select one:

O a. $28,800

O b. $17,280

c. $36,000

d. $21,600