Z Company: Beginning Inventory 70 units @ $13 Units Purchased 280 units @ $18 Ending inventory consisted of 30 units. They sold 320 units at $30 ea. All purchases and sales were made with cash. a. Compute the gross margin using the following cost flow assumptions. (FIFO, LIFO and weighted average). b. What is the dollar amout of difference in net income between using FIFO v LIFO? c. Determine the cash flow from operating activities, using each of the three cost flow assumptions ((FIFO, LIFO and weighted average). Ignore the effect of income taxes and explain why these cash flows have no differences.