Mott Company uses the units-of-activity method in computing depreciation. A new plant asset is purchased for $48,000 that will produce an estimated 100,000 units over its useful life. Estimated salvage value at the end of its useful life is $4,000.
What is the depreciation cost per unit?

a) $4.40 b) $4.80 c) $0.44 d) $0.48