Step-by-step explanation:
The computation is shown below:
a. Net purchase
= Purchase - Purchase Returns and Allowances - Purchase Discounts + Freight in
= $330,000 - $8,000 - $6,000 + $12,000
= $328,000
b. The cost of goods available for sale is
= Beginning inventory + purchase
= $50,000 + $328,000
= $378,000
c. The cost of goods sold is
= The cost of goods available for sale - ending inventory
= $378,000 - $80,000
= $298,000