4. Pembrook Company had beginning inventory on May 1 of $12,000. During the month, the company made purchases of $30,000 but returned $2,000 of goods because they were defective. At the end of the month, the inventory on hand was valued at $9,500. Calculate cost of goods available for sale and cost of goods sold for the month. 5. Principles of an efficient and effective accounting information system include all of the following except a. cost effectiveness. b. flexibility c. useful output. d. All of these options are principles. 6. Which of the following statements is incorrect? a. A major consideration in developing an accounting system is cost effectiveness. b. When an accounting system is designed, no consideration needs to be given to the needs and knowledge of the various users. changing information needs accurate c. The accounting system should be able to accommodate a variety of users and d. To be useful, information must be understandable, relevant, reliable, timely, and