Contribution margin

Willie Company sells $39,000$ units at $$37$ per unit. Variable costs are $$28\mathrm{.}49$ per unit, and fixed costs are $$192,500.$

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