At the beginning of 2020, your company buys a $28,800 piece of equipment that it expects to use for 4 years. The equipment has an estimated residual value of 2,000. The company expects to produce a total of 200,000 units. Actual production is as follows: 40,000 units in 2020, 47,000 units in 2021, 53,000 units in 2022, and 60,000 units in 2023. Required: Determine the depreciable cost. Calculate the depreciation expense per year under the straight-line method.