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?

Select one:

a$.$ $$4\mathrm{.}40$

b$.$ $$4\mathrm{.}80$

c$.$ $$\mathrm{.}48$

d$.$ $$\mathrm{.}44$