Local co$.$has sales of $$$$10\mathrm{.}4$ million and cost of sales of $$$$5\mathrm{.}7$ million. Its$$ selling, general and administrative expenses are $$470,000$ and its research and development is $$$$1\mathrm{.}3$ million. It has annual depreciation charges of $$$$1\mathrm{.}1$ million and a tax rate of $30\%.$

a$.$ What is Local$\text{'}$s gross$$ margin?

b$.$ What is Local$\text{'}$s operating$$ margin?

c$.$ What is Local$\text{'}$s net profit$$ margin?