Hello! I'm having trouble with this practice question. Thank you for your help!

Local Co. has sales of $10.4 million and cost of sales of $6.3 million. Its selling, general and administrative expenses are $480,000 and its research and development is $1.1 million. It has annual depreciation charges of $1.4 million and a tax rate of 35% a. What is Local's gross margin? b. What is Local's operating margin? c. What is Local's net profit margin? ... a. What is Local's gross margin? Local's gross margin is 39.4%. (Round to one decimal place.) b. What is Local's operating margin? Local's operating margin is % (Round to one decimal place.) c. What is Local's net profit margin? Local's net profit margin is % (Round to two decimal places.)