Answer:
d. Account numbers 3 and 9
Step-by-step explanation:
gross margin ratio = gross profit / total sales
gross profit = total sales - cost of goods sold
so gross margin ratio = (total sales - cost of goods sold) / total sales
so the accounts that affect gross margin are total sales (9) and cost of goods sold (3)
the gross margin gives us a percentage of what is left after covering COGS and can be used to pay for S&A expenses or result in profit.