Contribution margin

Willie Company sells $23,000$ units at $$13$ per unit. Variable costs are $$10\mathrm{.}66$ per unit, and fixed costs are $$16,700.$

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.$)$

c$.$ Operating income