Skysong, Inc. owns equipment that cost $64,300 when purchased on January 1, 2017. It has been depreciated using the straight-line method based on an estimated salvage value of $3,400 and an estimated useful life of 5 years. Prepare Skysong, Inc.'s journal entries to record the sale of the equipment in these four independent situations. (Credit account titles are automatically indented when amount is entered. Do not indent manually. Round answers to O decimal places, e.g.125. If no entry is required, select "No Entry" for the account titles and enter O for the amounts.) (a) Sold for $31,540 on January 1, 2020. (b) Sold for $31,540 on May 1, 2020. (c) Sold for $10,300 on January 1, 2020. (d) Sold for $10,300 on October 1, 2020.