Bluegill Company sells $7,500$ units at $$200$ per unit. Fixed costs are $$75,000,$ and operating income is $$675,000.$ 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

$\%$