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. The 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