Use the following information to complete this exercise: sales, 550 units for $16,950; beginning inventory, 300 units; purchases, 400 units; ending inventory, 150 units; and operating expenses, $7,000. Required: 1. Complete the table for each situation. In Situations A and B (costs rising), assume the following beginning inventory, 300 units at $15=$4,500; purchases, 400 units at $17=$6,800. In Situations C and D (costs falling), assume the opposite; that is, beginning inventory, 300 units at $17=$5,100; purchases, 400 units at $15=$6,000. Use periodic inventory procedures