Deuce Company purchased a truck for $50,000 on January 2, 2018. The asset has an expected salvage value of $5,000 at the end of its five-year useful life.

A) What depreciation method is used if depreciation expense is $6,000 in 2021?

B) How much is the depreciation expense in 2019 if double-declining balance depreciation is used?

C) How much is the depreciation expense in 2019 if sum-of-years digits depreciation is used?