Bluegill Company sells $9,100$ units at $$320$ per unit. Fixed costs are $$145,600,$ and operating income is $$1,019,200.$ Determine the $($a$)$ variable cost per unit, $($b$)$ unit contribution margin, and $($c$)$ contribution margin ratio. Round the contribution margin ratio to two decimal places.

a$.$ Variable cost per unit

$

b$.$ Unit contribution margin

$ per unit

c$.$ Contribution margin ratio $\%$