4. DER, Inc., manufactures a single product. The following information is available for 2022: Raw materials: Beginning balance: $5,000. Purchased $40,000 on credit. Direct materials used in production were three-fourths of direct materials bought. Work in process: Beginning balance: $3,100. Ending balance: $12,900. Units transferred out: 10,000. All units have the same average cost. Finished goods: Beginning balance: 0 units. Ending balance: 1,000 units. Also known: Prime costs Indirect labor $55,000 $11,000 Factory insurance $2,500 (80% relates to Utilities $8,000 production) Factory depreciation $7,000 Sales $14 Per unit Administrative and selling costs (other than utilities) $22,000 a. Complete the T-accounts for raw materials, work in process, and finished goods. b. What is the ending balance of raw materials? c. What is overhead? d. What is cost of goods manufactured? e. What is gross margin? f. What are period costs? g. What are conversion costs?