Use the following information to complete this exercise; sales, 550 units for $12,500; beginning inventory, 300 units; purchases, 400 units; ending inventory, 150 units; and operating expenses, $4,000. Required: 1. Complete the table for each situation. In Situations A and B (costs rising). assume the following: beginning inventory. 300 units at $12=$3,600, purchases, 400 units at $13=$5,200. In Situations C and D (costs falling), assume the opposite, that is, beginning inventory, 300 units at $13=$3,900; purchases, 400 units at $12=$4,800. Use periodic inventory procedures