Final answer:
The gross margin is calculated as sales minus the cost of goods sold, which results in a gross margin of $380,000.
Step-by-step explanation:
The gross margin is calculated by subtracting the cost of goods sold from the sales. In this case, the sales amount to $700,000, and the cost of goods sold is a total of $320,000, which is the sum of $100,000 and $220,000. Therefore, the gross margin can be calculated as:
Sales - Cost of Goods Sold = Gross Margin
$700,000 - $320,000 = $380,000
Thus, the gross margin is $380,000.