Income is to be evaluated under four different situations as follows: a. Prices are rising: (1) Situation A: FIFO is used. (2) Situation B: LIFO is used. b. Prices are falling: (1) Situation C: FIFO is used. (2) Situation D: LIFO is used. The basic data common to all four situations are sales, 500 units for $20,000; beginning inventory, 290 units; purchases, 420 units; ending inventory, 210 units; and operating expenses, $3,600. The income tax rate is 30%. Required: Complete the following tabulation for each situation. In Situations A and B (prices rising), assume the following: beginning inventory, 290 units at $10 = $2,900; purchases, 420 units at $12 = $5,040. In