Which of the Following Mathematical Equations Is Used to Calculate

Which of the following mathematical equations is used to calculate depreciation per unit under the units-of-production method of depreciation?

A) Depreciation per Unit = Revenue / Total Units-of-Production
B) Depreciation per Unit = Cost of Asset / Total Units-of-Production
C) Depreciation per Unit = (Cost of Asset − Trade-in Value) / Total Units-of-Production
D) Depreciation per Unit = (Cost of Asset − Maintenance Expense) / Total Units-of-Production