Local Co$.$ has sales of $$10\mathrm{.}0$ million and cost of sales of $$6\mathrm{.}0$ million. Its selling, general and administrative expenses are $$500,000$ and its research and development is $$1\mathrm{.}0$ million. It has annual depreciation charges of $$1\mathrm{.}0$ million and a tax rate of $25\%.$

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 $\%.($Round to two decimal places.$)$