Willie Company sells $15,000$ units at $$19$ per unit. Variable costs are $$11\mathrm{.}59$ per unit, and fixed costs are $$65,600.$

Determine $($a$)$ the contribution margin ratio, $($b$)$ the unit contribution margin, and $($c$)$ operating income.

a$.$ Contribution margin ratio $($Enter as a whole number.$)$

$\%$

b$.$ Unit contribution margin $($Round to the nearest cent.$)$

$

per unit

c$.$ Operating income

$