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 DDB# (cost#, salvage#, life#, period#, status%)
 
 Usage Notes
   ■ All arguments must be positive:
     • life# is the useful life of the asset (or the number of periods over
       which the asset is being depreciated).
     • life# and period# must use the same units. For example, if life is
       given in months, period must also be given in months.
     • status% can be any variable that returns information about the success
       or failure of the calculation. The value of status% will be 0 if the
       calculation was successful, and 1 if it was not.
 
   ■ The double-declining balance method computes depreciation at an
     accelerated rate. Depreciation is highest in the first period and
     decreases in successive periods.