Willie Company sells $18,000$ units at $$40$ per unit. Variable costs are $$24\mathrm{.}40$ per unit, and fixed costs are $$98,300.$

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

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

fill in the blank $1$

$\%$

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

fill in the blank $2$

per unit

c$.$ Operating income $

fill in the blank $3$