The units-of-production depreciation formula is:

a. (x)Deprecation per period = Asset cost + Estimated salvage value.

b. (y)Estimated total units of production during useful life of asset-Salvage Value

c. (z)Depreciation per period = Depreciation per unit Number of units of goods produced.

d. (x), (y), and (z).

e. (x) and (z) only.