Warren industries uses a process-costing system for its single product, which is manufactured from material x and material y. x and y are introduced to the product as follows: material x: added at the beginning of manufacturing material y: added at the 75% stage of completion the company started and completed 77,000 units during the period, and had an ending work-in-process inventory amounting to 16,700 units, 15% complete. which of the following choices correctly expresses the total equivalent units of production for material x and material y? material x material y a. 89,525 79,505 b. 89,525 89,525 c. 93,700 77,000 d. 93,700 79,505 e. 93,700 89,525