On January 1, Year 1, Li Company purchased an asset that cost $80,000. The asset had an expected useful life of five years and an estimated salvage value of $16,000. Li uses the straight-line method for the recognition of depreciation expense. At the beginning of the fourth year of usage, the company revised its estimated salvage value to $8,000. Based on this information, the amount of depreciation expense to be recognized at the end of Year 4 is:

Multiple Choice

a. $12,800.

b. $16,800.

c. $33,600.

d. $20,800.