please help with b and c

Local Co. has sales of $10.5 million and cost of sales of $6.3 million. Its selling, general and administrative expenses are $530,000 and its research and development is $1.2 million. It has annual depreciation charges of $1.3 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 40%. (Round to one decimal place.) b. What is Local's operating margin? Local's operating margin is \%. (Round to one decimal place.)