Selected information from the lowa Instruments accounting records for April follows: Materials Inventory Work-in-Process Inventory Credit Debit BB (4/1) 25,000 209,000 Credit Debit Labor 90,000 174,000 EB (4/30) 91,000 Cost of Goods Sold Debit Credit 3,500 Manufacturing Overhead Control Debit Credit 77,500 77,500 Finished Goods Inventory Debit Credit BB (4/1) 87,000 281,000 272,000 Applied Manufacturing Overhead Debit Credit 81,000 77,500 3,500 Additional information for April follows: The labor wage rate was $30 per hour. During the month, sales revenue was $320,000, and selling and administrative costs were $73,000. This company has no indirect materials or supplies. The company applies manufacturing overhead on the basis of direct labor-hours. Customer returns are discarded and not resold. Required: a. What was the cost of direct materials purchased in April? b. What was the over- or underapplied manufacturing overhead for April? c. What was the manufacturing overhead application rate in April? d. What was the cost of products completed during April? e. What was the balance of the Work-in-Process Inventory account at the beginning of April? f. What was the operating profit (or loss) for April? Any over- or underapplied overhead is written off to Cost of Goods Sold.