Use the following information to complete this exercise: sales, 750 units for $21, 600; beginning inventory, 500 units; purchases, 600 units; ending inventory, 350 units; and operating expenses, $7, 400. Complete the table for each situation. In Situations A and B (costs rising), assume the following: beginning inventory, 500 units at $12 = $6,000; purchases, 600 units at $14 = $8, 400. In Situations C and D (costs falling), assume the opposite; that is, beginning inventory, 500 units at $14 = $7,000; purchases, 600 units at $12 = $7, 200. Use periodic inventory procedures