McKnight Handcraft is a manufacturer of picture frames for large retailers. Every picture frame passes through two departments: the assembly department and the finishing department. This problem focuses on the assembly department. The process-costing system at McKnight has a single direct-cost category (direct materials) and a single indirect- cost category (conversion costs). Direct materials are added when the assembly department process is 10% complete. Conversion costs are added evenly during the assembly department's process. McKnight uses the weighted-average method of process costing. Consider the following data for the assembly department in April 2014. Physical Units Direct Conversion (Frames) Materials Costs Work in process, April 18 95 $1,665 $988 Started during April 2014 490 Completed during April 2014 455 Work in process, April 306 130 $17,640 $11,856 Total costs added during April 2014 Degree of completion: direct materials, 100%; conversion costs, 40%. bDegree of completion: direct materials, 100%; conversion costs, 30%. (Show all your work to receive full credits) a. Summarize total assembly department costs for April 2014 and assign total costs to units completed (and transferred out) and to units in ending work in process. Follow all five steps of process costing using the weighted average method. Lastly, do the process again using the FIFO method of process costing. b. Discuss any difference between the cost of work completed and transferred out and the cost of ending work in process in the assembly department under the weighted average method and the FIFO method