7. (4 points) On December 31,2017 , Ivanhoe Company acquired a computer from Plato Corporation by issuing a $500,000 zero-interest-bearing note, payable in full on December 31 , 2021. Ivanhoe Company's credit rating permits it to borrow funds from its several lines of credit at 7%. The computer is expected to have a 5 -year life and a $30,000 salvage value. a. Prepare the journal entry for the purchase on December 31,2017. b. Prepare any necessary adjusting entries relative to depreciation (use straight-line) and amortization (use effective-interest method) on December 31, 2018