Jan. 1 Retired a piece of machinery that was purchased on January 1, 2012. The machine cost $61,100 and had a useful life of 10 years with no salvage value June 30 Sold a computer that was purchased on January 1, 2020. The computer cost $36,000 and had a useful life of 4 years with no salvage value. The computer was sold for $4.300 cash Dec. 31 Sold a delivery truck for $9,090 cash. The truck cost