Can you please help with these four, not getting the concept. Thanks

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Assume that Corn Co. sold 7,200 units of Product A and 2,800 units of Product B during the past year. The unit contribution margins for Products A and B are $34 and $60, respectively. Corn has fixed costs of $368,000. The break-even point in units is Oa. 10,698 units Ob. 13,372 units Oc. 7,132 units d. 8,915 units