The following information pertains to Mason Company for 2018:

Beginning inventory...............................90 units @ $40

Units purchased...................................310 units @ $45

Ending inventory consisted of 30 units. Mason sold 370 units at $90 each. All purchases and sales were made with cash. Operating expenses amounted to $4,100.

Required

a. Compute the gross margin for Mason Company using the following cost flow assumptions: (1) FIFO, (2) LIFO, and (3) weighted average.

b. What is the amount of net income using FIFO, LIFO, and weighted average? (Ignore income tax considerations.)

c. Determine the cash flow from operating activities, using each of the three cost flow assumptions listed in Requirement a. Ignore the effect of income taxes, Explain why these cash flows have no differences.