1. Under what conditions may the unit costs of materials, labor, and overhead be com- puted by using only one equivalent pro- duction figure? 2. When is it necessary to use separate equiva- lent production figures in computing the unit costs of materials, labor, and overhead? 3. Why is it usually reasonable to assume that labor and factory overhead are added evenly throughout the production process? 4. If materials are not put into process uni- formly, what must be considered when determining the cost of the ending work in process