Returns the depreciation of an asset for a specified period using the fixed-declining balance method.
| Name | Type | Description |
| arg1 | number | Is the initial cost of the asset. |
| arg2 | number | Is the salvage value at the end of the life of the asset. |
| arg3 | number | Is the number of periods over which the asset is being depreciated (sometimes called the useful life of the asset). |
| arg4 | number | Is the period for which you want to calculate the depreciation. Period must use the same units as Life. |
| arg5 | number | Is the number of months in the first year. If month is omitted, it is assumed to be 12. |