3. 10 points. For the following transactions, make a journal entry, show the entry in t-accounts, or draw a diagram to represent the flow of costs, making sure to indicate the amount of the cost flow (Please treat a, b, and c as independent transactions. Don't put them together when preparing the t- accounts). a. Paid $20,000 cash for manufacturing overhead costs, and accrued $1,000 in depreciation on factory equipment. b. Finished work on the following units: good units costing $25,000, normal spoilage costing $4,000, and abnormal spoilage costing $1,000. c. Closed the manufacturing overhead account. Balances before adjustment were $231,000 (credit) in Manufacturing Overhead, $350,000 (debit) in Work-in-Process, $1,100,000 (debit) in Finished Goods, and $15,050,000 (debit) in Cost of Goods Sold. 4. 5 points. What is the purpose of a costing system? Explain in 1-2 sentences (at most).