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Change in Sales Mix and Contribution Margin could be sold. The operating income by unit of product is as follows: \begin{tabular}{lrrr} & SunSoundHeadphones & EarBlingHeadphones \\ \hline Sales price & $32.10 & $50.10 \\ Variable cost of goods sold & (18.00) & (28.10) \\ & Manufacturing margin & $14.10 & $22.00 \\ Variable selling and administrative expenses & (6.40) & (10.00) \\ Contribution margin & $7.70 & $12.00 \\ Fixed manufacturing costs & (2.90) & (4.50) \\ Operating income & $4.80 & $7.50 \\ & & & \end{tabular} two decimal place