What type of depreciation expense patter is used under each of the following methods and when is its use appropriate?

What type of depreciation expense patter is used under each of the following methods and when is its use appropriate? 


A Straight line B Units of Production C Double Declining Balance.



a. The straight-line method of depreciation causes an equal amount of depreciation expense to be apportioned to, or matched with, the revenues of each period. It is especially appropriate for tangible long-lived assets that are used at an approximately uniform level from period to period.
b. The units-of-production method of depreciation causes a depreciation expense pattern that varies in amount with the rate at which the asset is used productively each year. For example, if in the current year the asset is used twice as much as in the prior year, twice as much depreciation expense would be matched with the revenue of the current year as compared with the previous year. Usually use is measured in terms of productive output. The units-of-production method of depreciation is particularly appropriate for those assets that tend to earn revenue with use rather than with the passage of time. Thus, it normally would apply to assets that are not used at a uniform rate from period to period.
c. The double-declining-balance method of depreciation is a form of accelerated depreciation, causing a higher amount of depreciation expense to be matched with revenue in early periods of the estimated useful life of the asset. The double-declining-balance method is particularly appropriate when the long-lived assets perform more efficiently and therefore produce more revenue in the early years of their useful life than in the later years.


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