Returns the sum-of-years' digits depreciation of an asset for a specified period.
Cost is the initial cost of the asset.
Salvage is the value at the end of the depreciation (sometimes called the salvage value of the asset).
Life is the number of periods over which the asset is depreciated (sometimes called the useful life of the asset).
Per is the period and must use the same units as life.
SYD is calculated as follows:
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