The machine was originally purchased on January 1, 2016 for $40,000. The machine was estimated to have a useful life of 5 years and no residual value. The company uses straight-line depreciation. On December 31, 2017, the machine was sold for $25,000. a. Determine the gain (loss) on disposal, if any. a. Prepare the journal entry to record the sale. b. Assuming that the company had used the double-declining balance method instead of the straight-line method, explain how this would this have affected the gain (or loss) on the sale. (Do not include any calculations.)