Equipment with a cost of $30,000 ($2,000 residual value) is purchased on 1/1/19 with an estimated 4 year life, and the company uses straight line depreciation. The company decided to sell the machine for $20,000 on 6/30/30. Which of the following statements is true? A. There is a $10,000 gain on this transaction B. There is a $500 loss on this transaction C. The net book value of the asset is $16,000 D. There is a $500 gain on this transaction