to rd The following data relate to the of Inc, at 31, 2017 Original cost Year purchased Useful life Salvage value $51,520 2012 $57,120 2013 $89,600 2014 10 years15,000 hours 15 years $5,600 $89,600 2016 10 years $5,600 $3,472 Sum-of-the- years-digits $3,360 Straight Double-declining balance line Accum. depr through 2017$34,944 In the year an asset is purchased, Martinez, Inc. does not record any depreciation expense on the asset. In the year an asset is retired or traded in, Martinez, Inc. takes a full year's depreciation on the asset. The following transactions occurred during 2018 (a) On May 5, Machine A was sold for $14,560 cash. The company's bookkeeper recorded this retirement in the following manner in the cash receipts journal. 39,424 $16,800 $17,920 Cash Machinery (Machine A) (b) On December 31, it was determined that Machine B had been used 2,352 hours during 2018 (c) On December 31, before computing depreciation expense on Machine C, the management of Martinez, Inc. decided the useful life remaining from January 1, 2018 cost $31,360 and has a useful lif was 10 years. in that year. This in 2017 had been ex that a (d) On er 31, it was d f0