could someone explain this plz

Question 29 (1 point) Lauter Tun Corporation uses straight-line depreciation. Lauter Tun Corporation acquired equipment on January 1, 2012, for $300,000. The equipment had an estimated useful life of 10 years and an estimated salvage value of $25,000. On January 1, 2015, Lauter Tun Corporation revised the total useful life of the equipment from the previous 10 years to 5 years and the estimated salvage value to be $20,000. Compute depreciation expense for the year ending December 31, 2016. For your answer, make sure to put the number without dollar signs ($), commas (,), periods (.), and decimal points. Again, please state the number only without dollar signs, commas, periods, and decimal points for your answer. For example, if the answer happens to be 12345, then you must simply put 12345