Change in Contribution Margin additional Sun Sound and $26,300$ additional Ear Bling headphones could be sold. The operating income by unit of product is as follows:

$\backslash$table$[[,\backslash$table$[[$Sun Sound$],[$Headphones$]],\backslash$table$[[$Ear Bling$],[$Headphones$]]],[$Sales price,$$34\mathrm{.}40,$$$53\mathrm{.}70$