-1 Retired a piece of machinery that was purchased on January 1, 2012. The machine cost $62,600 and had a useful life of 10 years with no salvage value. e 30 Sold a computer that was purchased on January 1, 2020. The computer cost $36,400 and had a useful life of 4 years with no salvage value. The computer was sold for $4,400 cash. 31 Sold a delivery truck for $9.200 cash. The truck cost $25,000 when it was purchased on January 1, 2019, and was depreciated based on a 5-year useful life with a $3,700 salvage value.