Final answer:
Depreciation is a method of allocating the cost of an asset over its useful life. Salvage value can be used if the book value at the end of the asset's life is unknown.
Step-by-step explanation:
The given question seems to be related to the concept of depreciation in accounting. In accounting, depreciation is a method of allocating the cost of an asset over its useful life. The value of an asset, such as a vehicle or equipment, decreases over time due to wear and tear, obsolescence, and other factors.
To calculate the depreciation of an asset, we need to know the initial cost, useful life, and either the salvage value or the book value at the end of its life.
However, if we do not have information about the book value at the end of an asset's life, we can use the salvage value to find depreciation. Salvage value is the estimated residual value of the asset at the end of its useful life.