30. When using the weighted-average method of process costing, the computation of the cost of equivalent units includes: (1.5 Points) d. costs incurred during the current period plus all of the costs incurred in the prior period. b. costs incurred during the current period plus the cost of the beginning work in process inventory C. costs incurred during the current period plus the cost of the ending work in process inventory a. costs incurred during the current period only