Perpetual Inventory Using Weighted Average Beginning inventory, purchases, and sales for WCS12 are as follows:

Oct. 1 Inventory 300 units at $8

13. Sale 160 units

22. Purchase 360 units at $9

29. Sale 300 units

a. Assuming a perpetual inventory system and using the weighted average method, determine the weighted average unit cost after the October 22 purchase. Round your answer to two decimal places. $fill in the blank 1 per unit

b. Assuming a perpetual inventory system and using the weighted average method, determine the cost of goods sold on October 29. Round your "average unit cost" to two decimal places. $fill in the blank 2

c. Assuming a perpetual inventory system and using the weighted average method, determine the inventory on October 31. Round your "average unit cost" to two decimal places. $fill in the blank 3

If possible can you go step by step? I would really like to understand. Thank you.