Equipment purchased on January 3, 20x0, at a cost of $71,500, has an estimated useful life of 4 years and an estimated residual value of $4,500. a. What was the annual amount of depreciation for the years 20x0, 20x1, and 20x2 using the straight-line method of depreciation? b. What was the net book value of the equipment on January 1, 20x3? C. Assuming that the equipment was sold on January 2, 20x3, for $18,000, journalise the entry to record the sale. d. Assuming that the equipment had been sold on January 2, 20x3, for $23,000 instead of $18,000, journalise the entry to record the sale.