On January 1, Year 1, Marino Moving Company paid $48,000 cash to purchase a truck. The truck was expected to have a four year useful life and an $8,000 salvage value, Marino uses the straight-line method. On January 1, Year 3. Marino's accounting records contained the following account balances: Also, on January 1, Year 3 the company paid $10,000 to replace an engine that extended the useful life of the asset from a total of four years to a total of seven years. Based on this information, the amount of depreciation expense shown on the Year 3 income statement is