for $20.000 The estimated residual value of the computer system is $4,000, and the A computer aystem with an estimated Ite of four years was acquired on July 2010 depreciation for 2018 and 2017 using the following methods: DEPRECIATION 2016 2017 METHOD Straight-line Units of output (hours operated: 1.200 hours in 2016 and 2.600 hours in 2017) Double-declining-balance (at twice the straight-line rate) 150%-declining balance Using the information provided above, prepare (1) the journal entry to record the purchase of the computer system and the (2) the adjusting entries to record depreciation on December 31, 2016 and December 31, 2017, assuming the straight-line method was used: JOURNAL DEBIT ACCOUNT TITLES CREDIT DATE 07/01/2016 12/31/2016 12/31/2017