Contribution margin

Willie Company sells $17,000$ units at $$10$ per unit. Variable costs are $$7\mathrm{.}70$ per unit, and fixed costs are $$20,700.$

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

a$.$ Contribution margin ratio $($Enter as a whole numb$$r$.)$

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

c$.$ Operating income per unit