Lux Company started the month with 20 lamps in its beginning inventory that cost $30 each. During the month, Lux purchased 80 additional lamps for $31 each. At the end of the month, Lux counted its inventory and found that 25 lamps remained unsold. If Lux uses periodic weighted average cost, its Cost of Goods Sold for the month is $2,310.
To calculate the periodic weighted average cost, you need to calculate the total expenditure = 20 × $30 + 80 × $31 = $600 + $2480 = $3080
Now out of 100 lamps only 75 lamps are sold and 25 are unsold then
periodic weighted average cost = $3080 × 75 ÷ 100 = $2310
Weighted Average Unit Cost = Total Cost of Inventory ÷ Total Units in Inventory
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