Hess Company's inventory records show the following data for the month of September:

Units Unit Cost

Inventory, September 1 100 $3.00

Purchases: September 8 450 3.50

September 18 300 3.70

A physical inventory on September 30 shows 150 units on hand.

a. Calculate the value of ending inventory and cost of goods sold if the company uses FIFO inventory costing and a periodic inventory system.

b. Calculate the value of ending inventory and cost of goods sold if the company uses LIFO inventory costing and a periodic inventory system.

c: Calculate the value of ending inventory and cost of goods sold if the company uses average costing and a periodic inventory system. Remember, average cost is a weighted average.