FedEx purchased a moving truck for $50,000. It is estimated that its expected total mileage is 100,000 miles, and the salvage value is $5,000. In the first year the actual mileage is 50,000 miles. What is the depreciation expense in the first year if FedEx uses units of production method? a)15,500 b) 9,000 c) 22,500 d) 12,500