A manufacturing firm purchased a new machine to be used in its production process for $18,000 on January 1, 2019. The firm estimates the machine will have a three year life and has a salvage value of $3,000. The firm also estimates that the machine will produce 9,000 units. The entry to record the purchase of the machine on January 1, 2019 is given below (using A=Asset, C-A= Contra-Asset, L=Liability, R=Revenue, E=Expense). Account Type Direction Account Titles Debit Credit A + $18,000 Machinery Cash A $18,000 Required: record the adjusting entry for depreciation at the end of the first year on December 31, 2019 using the units-of-production method (list debited account first followed by credited account as in the above entry). The machine produced 2,800 units during 2019. Account Type Direction Account Titles Debit Credit