Alice is planning to open up a sandwich shop. An estimate of her costs$/$revenues are as follows:

average listed sales price per sandwich: $$14\mathrm{.}75$

yearly rent: $$36000$

monthly fixed utility bill: $$800$

average cost of ingredients per sandwich: $$6\mathrm{.}55$

monthly labour bill $($fixed$)$: $$10500$

miscellaneous fixed supplies$/$month: $$100$

misc. variable supplies per sandwich : $$1\mathrm{.}55$

What is her contribution margin per sandwich?

Question $13$ options:

$$8\mathrm{.}20$

$$8\mathrm{.}35$

$$6\mathrm{.}65$

$$6\mathrm{.}55$