A14. Stewart Ltd purchased a new Machine for $60 000, (net of GST). Originally it had an estimated useful life of 4 years and a residual value of $12 000. The straight-line method is used. At the start of the third year, Stewart Ltd revised the estimated residual value of the Machine to nil. What depreciation expense should be recorded for the Machine for the third year? (a) $3 000 (b) $18 000 $12 000 $15 000 (e) $36 000 (d)