On January 1, 2016, the Harold Company purchased equipment at a cost of $400,000. The equipment was expected to have a service life of 10 years and a $20,000 residual value. The companys fiscal year-end is December 31, and the double-declining balance (DDB) depreciation method is used. During 2018, the company switched from the DDB to the straight-line method. In 2018, the adjusting entry to depreciation expense is:

a. $22,500

b. $29,500

c. $31,625

d. $44,775