Hi! I'm stuck with this Qs. As I can't upload more than 1 Qs, this is one of the Qs I have.

May I know how to solve this question? Thank you in advance!

Smart Enterprise bought a machine costing $40,000 on 1 Januaryr 2015. The machine has a useful life of 4 years. The supplier which sold the machine had agreed to take back the machine for $4,000 at the end of the useful life. The company scal yearend is 31 December. Compute the depreciation expense, accumulated depreciation and net book value ofthe machine for the years 2015, 2010, 201? and 2013 using: (1') The straightline method {11) The doubledeclining balance method