Contribution Margin

United Merchants Company sells $19,000$ units at $$41$ per unit. Variable costs are $$31\mathrm{.}98$ per unit, and fixed costs are $$90,800.$ 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