Sandblasting equipment acquired at a cost of $40,000 has an estimated

Sandblasting equipment acquired at a cost of $40,000 has an estimated residual value of $8,000 and an estimated useful life of 8 years. it was placed into service on April 1 of the current fiscal year, which ends on December 31. Determine the depreciation for the current fiscal year and for the following fiscal year by (a) the straight line method and (b) the double declining balance method