Exercise 9-3 Here are selected 2017 transactions of Swifty Corporation Jan. 1 June 30 Dec. Retired a piece of machinery that was purchased on January 1, 2007. The machine cost $61,300 and had a useful life of 10 years with no salvage value. Sold a computer that was purchased on January 1, 2015. The computer cost $35,200 and had a useful life of 4 years with no salvage value. The computer was sold for $5,700 cash Sold a delivery truck for $9,500 cash. The truck cost $23,000 when it was purchased on January 1, 2014, and was depreciated based on a 5-year useful life with a $4,000 salvage value