A fixed asset was originally bought for £22000 and depreciated on a straight-line basis over five years, assuming a disposal value of £2000 for the asset at the end of that time . At the beginning of Year 3 a re-evaluation of the asset's usefulness produced a revised estimate ofsix years remaining useful life but with no disposal proceeds at the end of that time.

(a) Calculate the depreciation expense for Year 3 and expl ain the basis of your calculation.

(b) Describe any alternative way in which the depreciation expense for Year 3 and subsequent years may have been calculated.