On January 2, 2017, Garr Company acquired machinery at a cost of $320,000. This machinery was being depreciated by the double-declining- balance method over an estimated useful life of 8 years, with no residual value. At the beginning of 2019, Garr changed to the straight-line method of depreciation. What is the amount of depreciation expense that Garr should record for 2019?
a. $22,500
b. $30,000
c. $36,000
d. $140,000