Answer: 76.3%
Explanation: Gross profit margin is calculated by dividing the gross profit (difference between revenue and cost of goods sold) by revenue (Net sales). It could be expressed as a percentage by multiplying by 100.
Gross profit margin = (gross profit ÷ net sales) * 100
Gross profit = $3,320
Net sales = $4,350
Gross profit margin = ($3,320÷$4,350) * 100
0.763 * 100 = 76.3%