Douglas Cabinet Company manufactures a single model of bathroom cabinet. The company's contribution margin ratio is \(45 \%\). Douglas is considering an advertising campaign that would cost \(\$ 8,000\) but is expected to increase sales by \(\$ 22,000\).

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A. What dollar amount of the additional revenue will go to cover variable costs?

B. Should Douglas buy the advertising? Explain your answer.

C. If Douglas's contribution margin ratio is \(30 \%\) instead of \(45 \%\), should it still buy the advertising? Explain your answer.