A machine was purchased on 3 January 2019 for $48000, net of GST. The machine had an estimated residual value of $6000 and an estimated useful life of 5 years. Depreciation expense for the year ended 31 December 2019, using sum-of-the-years'-digits method, is:

Select one:

a.$8400

b.$16000

c.$19200

d.$14000