The weighted average unit cost is $10.61.
The cost of goods sold on October 29 is $2,122.39.
The inventory on October 21 is $3138.
The weighted cost of goods sold = [(310 x 9) + ($12 x 360)] / (360 + 310)
(2790 +4320) / 670
7,110 / 670 = $10.61
Cost of the goods sold on October 29 = average unit cost x number of goods sold
$10.61 x 200 = $2,122.39
Inventory on October 21 = ending inventory x average cost
ending inventory = total inventory - total inventory sold
Inventory on October 21 = 300 units x 10.61 = $3,183
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