Stillman Company purchased a new machine at the start of its current year at a cost of $37,500. The machine is expected to serve for five years and to have a salvage value of $3,000. Ronald L. Stillman, the chief executive officer, has asked for information as to the effects of alternative depreciation methods.

Calculate the annual depreciation expense for each of the five years of expected life of the machine, the accumulated depreciation at the end of each year, and the book value at the end of each year using the following methods:
(b) Double-declining-balance

Stillman Company purchased a new machine at the start of its current year at a cost of $37,500. The machine is expected to serve for five years and to have a salvage value of $3,000. Ronald L. Stillman, the chief executive officer, has asked for information as to the effects of alternative depreciation methods.

Calculate the annual depreciation expense for each of the five years of expected life of the machine, the accumulated depreciation at the end of each year, and the book value at the end of each year using the following methods:
(c) Sum-of-the-years'-digits