Mortensen Industries, which uses a process-costing system, adds material at the beginning of production and incurs conversion cost evenly throughout manufacturing. The following selected information was taken from the company's accounting records: Total equivalent units of materials: 5,000 Total equivalent units of conversion: 4,400 Units started and completed during the period: 3,500 On the basis of this information, the ending work-in-process inventory's stage of completion is: Multiple Choice 60%. 40%. 80%. 70%. some other percentage not listed.