If IntervaleIntervale $$Railway$\text{'}$s fixed costs total $ $90$ comma $000$$$90,000$ per$$ month, the variable cost per passenger is $ $45$$$45,$ and tickets sell for $ $75$$$75,$ what is the contribution margin per unit and contribution margin$$ ratio?

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Part $1$

A$.$

$ $45$$$45$ per$$ passenger; $6060\%$

B$.$

$ $30$$$30$ per$$ passenger; $6060\%$

C$.$

$ $30$$$30$ per$$ passenger; $4040\%$

D$.$

$ $45$$$45$ per$$ passenger;$4040\%$