XYZ company's costing system uses two cost categories, direct materials and conversion costs. Each product must pass through the Assembly Department and the Testing Department. Direct materials are added at the beginning of the production process. Conversion costs are allocated evenly throughout production. It uses weighted average costing. Data for the Assembly Department for June 2020 are: WIP beginning 50% complete 250 units, Units started during June 800 units and WIP ending 75% complete 150 units. The number of units started and transferred to testing department is: a. 750 units. b. 950 units. C. 900 units. O d. 650 units