The DDB() function calculates the depreciation of an asset for a given period using the arithmetic-declining method. The factor is optional, if omitted it is assumed to be 2. All the parameter must be greater than zero.
De funksje DDB () berekkent de ôfskriuwing fan in kredytpost oer in opjûne perioade middels de "arithmetic declining" - ôfskriuwingsmetoade. De faktor is opsjoneel, by weilitten wurdt 2 as wearde oannommen. Alle parameters moatte grutter as nul wêze.