An asset with a cost of $15,000, useful life of 5 years or 16,000 units, and residual value of $2,000 was purchased on Jan 1, 2012. The asset produced 3,000 units in first year, 4,000 units in the second year and 4,500 units in the third year. What would be the depreciation of the year 2015 using Straight line, Units-of-production and Double decline methods?