Local Co$.$ has sales of $$10\mathrm{.}4$ million and cost of sales of $$5\mathrm{.}9$ million. Its selling, general and administrative expenses are $$450,000$ and its research and development is $$1\mathrm{.}2$ million. It has annual depreciation charges of $$1\mathrm{.}3$ million and a tax rate of $20\%.$

a$.$ What is Local's gross margin?

b$.$ What is Local's operating margin?

c$.$ What is Local's net profit margin?