On 1 January 2018, a new motor vehicle with a useful life of six years and an estimated trade-in value of $15 000 was purchased by a business for $75 000. The straight-line method is employed. What was the accumulated depreciation for this motor vehicle at the year ended 30 June 2019? Select one: O a. $20 000 O b. $5000 c. $10 000 O d. $15 000