Change in Contribution Margin $28,800$ additional Sun Sound and $31,700$ 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,$$35\mathrm{.}50,$$$55\mathrm{.}40$