A firm's sales is $$4,000,000.$ Its cost of goods sold is $$3,000,000.$ The firm has a positive amount of operating expenses. What is a possible value of its Operating Profit Margin?

A$.0\mathrm{.}2$

B$.0\mathrm{.}3$

C$.0\mathrm{.}5$

D$.0\mathrm{.}4$